feat: add export/import streaming to the pluggable backends

Add backend-agnostic data export/import over an NDJSON wire format, plus an
inspect utility, exposed via three new CLIs and an HTTP export endpoint.

- ExportImport types + filter helpers (kind/record scoping, hard-intersection
  of filters) in src/db/{types/ExportImport,export/filter}.ts
- SqliteInterface implements Exportable + Importable: signal-checked async
  generator export (one query per table, per-record yield, trailing error
  sentinel on mid-stream failure) and a manually-driven import transaction
  that rolls back on any error/abort and never commits partial data
- ApiInterface implements Exportable via its own fetch({signal})
- computeForcedExportFilter enforces non-global-admin scope (resided-in abodes
  + co-resident users, intersected with apikey restrict_*); GET /export
  intersects it with the caller's filter and wires an AbortController to the
  response socket
- inspectExportStream reports kinds/counts from any stream without a db
- abode-export / abode-import / abode-inspect CLIs (import is sqlite-only)
- Secrets are not exported: imported users default to '#unset' passwords and
  apikeys are re-minted a token (ClientApikey view round-trips exactly)
- test/tools/export-import.test.ts: round-trip, filter narrowing, forced-scope,
  export/import cancellation, in-process Koa endpoint, inspect

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitea/actions/setup/action.yml

@@ -0,0 +1,9 @@
+name: Setup
+description: Set up the Node version required by this repository. Requires actions/checkout to have already run.
+
+runs:
+  using: composite
+  steps:
+    - uses: actions/setup-node@v4
+      with:
+        node-version-file: .node-version

.gitea/workflows/ci.yml

@@ -0,0 +1,124 @@
+name: CI
+
+on:
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  install-and-build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./.gitea/actions/setup
+
+      - name: Clean install dependencies
+        run: npm ci
+
+      - name: Production build
+        run: npm run build
+
+      - name: Archive dependencies
+        run: tar -czf node_modules.tar.gz node_modules
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: node_modules-${{ github.run_id }}
+          path: node_modules.tar.gz
+
+      - name: Archive build artifacts
+        run: tar -czf build-artifacts.tar.gz dist
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: build-artifacts-${{ github.run_id }}
+          path: build-artifacts.tar.gz
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./.gitea/actions/setup
+
+      - name: Clean install dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint
+
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./.gitea/actions/setup
+
+      - name: Clean install dependencies
+        run: npm ci
+
+      - name: Check formatting
+        run: npm run format:check
+
+  typecheck-source:
+    runs-on: ubuntu-latest
+    needs: install-and-build
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./.gitea/actions/setup
+
+      - uses: actions/download-artifact@v3
+        with:
+          name: node_modules-${{ github.run_id }}
+
+      - uses: actions/download-artifact@v3
+        with:
+          name: build-artifacts-${{ github.run_id }}
+
+      - name: Restore dependencies and build artifacts
+        run: |
+          tar -xzf node_modules.tar.gz
+          tar -xzf build-artifacts.tar.gz
+
+      - name: Typecheck source
+        run: npm run typecheck
+
+  typecheck-tests:
+    runs-on: ubuntu-latest
+    needs: install-and-build
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./.gitea/actions/setup
+
+      - uses: actions/download-artifact@v3
+        with:
+          name: node_modules-${{ github.run_id }}
+
+      - name: Restore dependencies
+        run: tar -xzf node_modules.tar.gz
+
+      - name: Typecheck tests
+        run: npm run typecheck:test
+
+  test:
+    runs-on: ubuntu-latest
+    needs: install-and-build
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./.gitea/actions/setup
+
+      - uses: actions/download-artifact@v3
+        with:
+          name: node_modules-${{ github.run_id }}
+
+      - name: Restore dependencies
+        run: tar -xzf node_modules.tar.gz
+
+      - name: Run full test suite
+        run: npm test

.node-version

@@ -0,0 +1 @@
+22

.prettierignore

@@ -0,0 +1,2 @@
+dist
+node_modules

eslint.config.js

@@ -0,0 +1,22 @@
+import eslint from "@eslint/js";
+import tseslint from "typescript-eslint";
+
+export default tseslint.config(
+  {
+    ignores: ["dist/**", "node_modules/**"],
+  },
+  eslint.configs.recommended,
+  tseslint.configs.recommended,
+  {
+    rules: {
+      "no-control-regex": "off",
+      "no-empty": "off",
+      "no-fallthrough": "off",
+      "prefer-const": "off",
+      "@typescript-eslint/no-empty-object-type": "off",
+      "@typescript-eslint/no-explicit-any": "off",
+      "@typescript-eslint/no-non-null-asserted-optional-chain": "off",
+      "@typescript-eslint/no-unused-vars": "off",
+    },
+  },
+);

package.json

@@ -9,7 +9,10 @@
     "abode-migrate": "dist/bin/abode-migrate.cjs",
     "abode-repl": "dist/bin/abode-repl.cjs",
     "abode-web": "dist/bin/abode-web.cjs",
-    "abode-tui": "dist/bin/abode-tui.cjs"
+    "abode-tui": "dist/bin/abode-tui.cjs",
+    "abode-export": "dist/bin/abode-export.cjs",
+    "abode-import": "dist/bin/abode-import.cjs",
+    "abode-inspect": "dist/bin/abode-inspect.cjs"
   },
   "scripts": {
     "repl": "tsx --import ./src/meta/dev/register.ts",
@@ -18,6 +21,9 @@
     "abode-web": "tsx --import ./src/meta/dev/register.ts --import ./src/meta/dev/webhot.ts src/bin/abode-web.ts",
     "abode-tui": "tsx --import ./src/meta/dev/register.ts --import ./src/meta/dev/silenthot.ts src/bin/abode-tui.ts",
     "abode-sources": "tsx --import ./src/meta/dev/register.ts src/bin/abode-sources.ts",
+    "abode-export": "tsx --import ./src/meta/dev/register.ts src/bin/abode-export.ts",
+    "abode-import": "tsx --import ./src/meta/dev/register.ts src/bin/abode-import.ts",
+    "abode-inspect": "tsx --import ./src/meta/dev/register.ts src/bin/abode-inspect.ts",
     "build": "NODE_ENV=production npm run build:impl",
     "build:impl": "rm -rf dist && tsx node_modules/.bin/webpack && chmod +x dist/bin/* && chmod -x dist/bin/*.*",
     "test": "node --import tsx/esm --import ./src/meta/dev/register.ts --test $(find test -name '*.test.ts' | sort)",
@@ -25,7 +31,9 @@
     "test:shared": "node --import tsx/esm --import ./src/meta/dev/register.ts --test $(find test/backends -name 'index.test.ts' | sort)",
     "test:tools": "node --import tsx/esm --import ./src/meta/dev/register.ts --test $(find test/tools -name '*.test.ts' | sort)",
     "typecheck": "tsc --noEmit",
-    "typecheck:test": "tsc --noEmit -p tsconfig.test.json"
+    "typecheck:test": "tsc --noEmit -p tsconfig.test.json",
+    "lint": "eslint .",
+    "format:check": "prettier --check ."
   },
   "dependencies": {
     "@koa/bodyparser": "^6.0.0",
@@ -44,21 +52,25 @@
     "react-redux": "^9.2.0"
   },
   "devDependencies": {
+    "@eslint/js": "^9.39.5",
     "@types/better-sqlite3": "^7.6.13",
-    "@types/pg": "^8.20.0",
     "@types/koa": "^3.0.0",
     "@types/koa__router": "^12.0.4",
+    "@types/pg": "^8.20.0",
     "@types/react": "^19.1.12",
     "@types/webpack-bundle-analyzer": "^4.7.0",
     "copy-webpack-plugin": "^13.0.1",
     "css-loader": "^7.1.2",
     "dynohot": "^2.1.1",
+    "eslint": "^9.39.5",
     "mini-css-extract-plugin": "^2.9.4",
+    "prettier": "^3.6.2",
     "raw-loader": "^4.0.2",
     "scss-loader": "^0.0.1",
     "ts-loader": "^9.5.4",
     "tsx": "^4.20.5",
     "typescript": "^5.9.2",
+    "typescript-eslint": "^8.65.0",
     "val-loader": "^6.0.0",
     "webpack-bundle-analyzer": "^4.10.2",
     "webpack-cli": "^6.0.1"

src/bin/abode-export.ts

@@ -0,0 +1,97 @@
+import { createWriteStream } from "node:fs";
+import { pipeline } from "node:stream/promises";
+import { getDbInterface } from "../db/index.js";
+import { isExportable, type ExportFilter } from "../db/types/ExportImport.js";
+import { isExportKind } from "../db/export/filter.js";
+
+const args = process.argv.slice(2);
+
+function printUsage(err: boolean | string = false): never {
+  const log = (err ? console.error : console.log).bind(console);
+  if (typeof err === "string") {
+    log(`Error: ${err}`);
+    log("");
+  }
+  log("Usage:");
+  log("\tabode-export --help");
+  log(
+    "\tabode-export <database-url> [--kinds=user,abode,...] [--exclude-kinds=...] \\",
+  );
+  log("\t             [--abodes=aid,...] [--users=uid,...] [--out=file|-]");
+  process.exit(err ? 1 : 0);
+}
+
+if (["-h", "--help", "help"].some((x) => args.includes(x))) printUsage();
+
+let url: string | undefined;
+const flags = new Map<string, string>();
+for (const arg of args) {
+  if (arg.startsWith("--")) {
+    const eq = arg.indexOf("=");
+    if (eq === -1) printUsage(`invalid flag: ${arg}`);
+    flags.set(arg.slice(2, eq), arg.slice(eq + 1));
+  } else if (url === undefined) {
+    url = arg;
+  } else {
+    printUsage("too many arguments");
+  }
+}
+if (!url) printUsage("missing <database-url>");
+
+const knownFlags = ["kinds", "exclude-kinds", "abodes", "users", "out"];
+for (const key of flags.keys()) {
+  if (!knownFlags.includes(key)) printUsage(`unknown flag: --${key}`);
+}
+
+function parseList(value: string | undefined): string[] | undefined {
+  if (value === undefined) return undefined;
+  return value.split(",").filter(Boolean);
+}
+function parseKinds(value: string | undefined) {
+  const list = parseList(value);
+  if (!list) return undefined;
+  const bad = list.filter((k) => !isExportKind(k));
+  if (bad.length) printUsage(`invalid kind(s): ${bad.join(", ")}`);
+  return list.filter(isExportKind);
+}
+
+const filter: ExportFilter = {};
+const kinds = parseKinds(flags.get("kinds"));
+if (kinds) filter.kinds = kinds;
+const excludeKinds = parseKinds(flags.get("exclude-kinds"));
+if (excludeKinds) filter.excludeKinds = excludeKinds;
+const abodes = parseList(flags.get("abodes"));
+if (abodes) filter.abodes = abodes;
+const users = parseList(flags.get("users"));
+if (users) filter.users = users;
+
+const db = await getDbInterface(url);
+if (!isExportable(db)) {
+  console.error(`Error: backend '${db.name}' does not support export`);
+  process.exit(1);
+}
+
+const out = flags.get("out") ?? "-";
+const dest =
+  out === "-" ? process.stdout : createWriteStream(out, { encoding: "utf8" });
+
+const ac = new AbortController();
+const onSignal = () => ac.abort();
+process.on("SIGINT", onSignal);
+process.on("SIGTERM", onSignal);
+
+try {
+  await pipeline(db.export({ filter, signal: ac.signal }), dest);
+} catch (e) {
+  if (ac.signal.aborted) {
+    console.error("Export aborted");
+    process.exit(130);
+  }
+  throw e;
+} finally {
+  process.off("SIGINT", onSignal);
+  process.off("SIGTERM", onSignal);
+  await db.close().catch(() => {});
+}
+
+process.exit(0);

src/bin/abode-import.ts

@@ -0,0 +1,106 @@
+import { createReadStream } from "node:fs";
+import { getWrappedDb } from "../db/sqlite/impl/index.js";
+import { SqliteInterface } from "../db/sqlite/SqliteInterface.js";
+import { parseSqliteUrl } from "../db/sqlite/url.js";
+import { isExportKind } from "../db/export/filter.js";
+import type { ExportFilter } from "../db/types/ExportImport.js";
+
+const args = process.argv.slice(2);
+
+function printUsage(err: boolean | string = false): never {
+  const log = (err ? console.error : console.log).bind(console);
+  if (typeof err === "string") {
+    log(`Error: ${err}`);
+    log("");
+  }
+  log("Usage:");
+  log("\tabode-import --help");
+  log("\tabode-import <sqlite-database-url> <input-file|-> [--kinds=...] \\");
+  log(
+    "\t             [--exclude-kinds=...] [--abodes=aid,...] [--users=uid,...]",
+  );
+  log("");
+  log(
+    "The target database must already be migrated (run abode-migrate first).",
+  );
+  process.exit(err ? 1 : 0);
+}
+
+if (["-h", "--help", "help"].some((x) => args.includes(x))) printUsage();
+
+const positional: string[] = [];
+const flags = new Map<string, string>();
+for (const arg of args) {
+  if (arg.startsWith("--")) {
+    const eq = arg.indexOf("=");
+    if (eq === -1) printUsage(`invalid flag: ${arg}`);
+    flags.set(arg.slice(2, eq), arg.slice(eq + 1));
+  } else {
+    positional.push(arg);
+  }
+}
+
+const url = positional[0];
+const input = positional[1];
+if (!url) printUsage("missing <sqlite-database-url>");
+if (!input) printUsage("missing <input-file|->");
+if (positional.length > 2) printUsage("too many arguments");
+
+const knownFlags = ["kinds", "exclude-kinds", "abodes", "users"];
+for (const key of flags.keys()) {
+  if (!knownFlags.includes(key)) printUsage(`unknown flag: --${key}`);
+}
+
+function parseList(value: string | undefined): string[] | undefined {
+  if (value === undefined) return undefined;
+  return value.split(",").filter(Boolean);
+}
+function parseKinds(value: string | undefined) {
+  const list = parseList(value);
+  if (!list) return undefined;
+  const bad = list.filter((k) => !isExportKind(k));
+  if (bad.length) printUsage(`invalid kind(s): ${bad.join(", ")}`);
+  return list.filter(isExportKind);
+}
+
+const filter: ExportFilter = {};
+const kinds = parseKinds(flags.get("kinds"));
+if (kinds) filter.kinds = kinds;
+const excludeKinds = parseKinds(flags.get("exclude-kinds"));
+if (excludeKinds) filter.excludeKinds = excludeKinds;
+const abodes = parseList(flags.get("abodes"));
+if (abodes) filter.abodes = abodes;
+const users = parseList(flags.get("users"));
+if (users) filter.users = users;
+
+// Import is sqlite-only: construct the backend directly rather than resolving
+// generically, so it can never be pointed at a remote (api) target.
+const db = new SqliteInterface(getWrappedDb(...parseSqliteUrl(url)));
+
+const source = input === "-" ? process.stdin : createReadStream(input);
+
+const ac = new AbortController();
+const onSignal = () => ac.abort();
+process.on("SIGINT", onSignal);
+process.on("SIGTERM", onSignal);
+
+try {
+  const result = await db.import(source, { filter, signal: ac.signal });
+  const total = Object.values(result.counts).reduce((a, b) => a + b, 0);
+  console.log(`Imported ${total} record(s):`);
+  for (const [kind, count] of Object.entries(result.counts)) {
+    console.log(`- ${kind}: ${count}`);
+  }
+} catch (e) {
+  if (ac.signal.aborted) {
+    console.error("Import aborted; no changes committed");
+    process.exit(130);
+  }
+  throw e;
+} finally {
+  process.off("SIGINT", onSignal);
+  process.off("SIGTERM", onSignal);
+  await db.close().catch(() => {});
+}
+
+process.exit(0);

src/bin/abode-inspect.ts

@@ -0,0 +1,68 @@
+import { createReadStream } from "node:fs";
+import { inspectExportStream } from "../db/export/inspect.js";
+import { isExportKind } from "../db/export/filter.js";
+import type { ExportKind } from "../db/types/ExportImport.js";
+
+const args = process.argv.slice(2);
+
+function printUsage(err: boolean | string = false): never {
+  const log = (err ? console.error : console.log).bind(console);
+  if (typeof err === "string") {
+    log(`Error: ${err}`);
+    log("");
+  }
+  log("Usage:");
+  log("\tabode-inspect --help");
+  log("\tabode-inspect <input-file|-> [--stop-after=note,...]");
+  process.exit(err ? 1 : 0);
+}
+
+if (["-h", "--help", "help"].some((x) => args.includes(x))) printUsage();
+
+let input: string | undefined;
+const flags = new Map<string, string>();
+for (const arg of args) {
+  if (arg.startsWith("--")) {
+    const eq = arg.indexOf("=");
+    if (eq === -1) printUsage(`invalid flag: ${arg}`);
+    flags.set(arg.slice(2, eq), arg.slice(eq + 1));
+  } else if (input === undefined) {
+    input = arg;
+  } else {
+    printUsage("too many arguments");
+  }
+}
+if (!input) printUsage("missing <input-file|->");
+
+for (const key of flags.keys()) {
+  if (key !== "stop-after") printUsage(`unknown flag: --${key}`);
+}
+
+let stopAfterKinds: ExportKind[] | undefined;
+const rawStop = flags.get("stop-after");
+if (rawStop !== undefined) {
+  const list = rawStop.split(",").filter(Boolean);
+  const bad = list.filter((k) => !isExportKind(k));
+  if (bad.length) printUsage(`invalid kind(s): ${bad.join(", ")}`);
+  stopAfterKinds = list.filter(isExportKind);
+}
+
+const source = input === "-" ? process.stdin : createReadStream(input);
+
+const { counts, meta } = await inspectExportStream(source, { stopAfterKinds });
+
+if (meta) {
+  console.log("Meta:");
+  console.log(`- format version: ${meta.v ?? "?"}`);
+  console.log(`- exported at: ${meta.exportedAt ?? "?"}`);
+  console.log(`- source backend: ${meta.source ?? "?"}`);
+  if (meta.filter && Object.keys(meta.filter).length) {
+    console.log(`- effective filter: ${JSON.stringify(meta.filter)}`);
+  }
+}
+console.log("Counts:");
+const entries = Object.entries(counts);
+if (!entries.length) console.log("(none)");
+for (const [kind, count] of entries) console.log(`- ${kind}: ${count}`);
+
+process.exit(0);

src/bin/abode-migrate.ts

@@ -40,7 +40,7 @@ switch (cmd) {
     if (!current.length) console.log("(none)");
     for (const migration of current) {
       console.log(
-        `- ${migration.id} (${migration.name}) applied at ${migration.applied_at}`
+        `- ${migration.id} (${migration.name}) applied at ${migration.applied_at}`,
       );
     }
     break;
@@ -73,7 +73,7 @@ switch (cmd) {
         password: await hashPassword("changeme"),
       });
       console.log(
-        `Created user 'admin@codi.moe' (${uid}) with password 'changeme' and admin flag`
+        `Created user 'admin@codi.moe' (${uid}) with password 'changeme' and admin flag`,
       );
     }
     users = await db.listUsers();
@@ -88,7 +88,7 @@ switch (cmd) {
           expires_at: null,
         });
         console.log(
-          `Created apikey '${token}' (${apikey.kid}) with permissions admin, all and no expiry`
+          `Created apikey '${token}' (${apikey.kid}) with permissions admin, all and no expiry`,
         );
       }
     }

src/bin/abode-sources.ts

@@ -21,7 +21,7 @@ if (args.length > 1) printUsage("too many arguments");
 
 console.log(
   `Compiled with ${compiledSources.length} sources:`,
-  compiledSources.join(", ")
+  compiledSources.join(", "),
 );
 
 const url = args[0] ?? "abode://";
@@ -31,7 +31,7 @@ for (const source of sources) {
   console.log(`- ${source.name}`);
   console.log(
     "  - protocols:",
-    source.protocols.map((x) => `'${x}'`).join(" ")
+    source.protocols.map((x) => `'${x}'`).join(" "),
   );
   const match = source.checkUrl(url);
   console.log(`  - matches url: ${match}`);
@@ -41,7 +41,7 @@ for (const source of sources) {
       console.log(
         `  - generates an interface named ${db.name} ${
           db.backend ? "with" : "without"
-        } backend`
+        } backend`,
       );
       await db.close().catch(console.error);
     } catch (e) {
@@ -53,7 +53,7 @@ for (const source of sources) {
       console.log(
         `  - generates a migrator knowing ${
           db.listAvailableMigrations().length
-        } migrations`
+        } migrations`,
       );
     } catch (e) {
       console.error(e);

src/bin/abode-tui.ts

@@ -30,7 +30,7 @@ const bgColor = await new Promise<string>((ok, ko) => {
   process.stdin.once("data", (chunk) => {
     const result = chunk.toString("utf8");
     const match = result.match(
-      /^\u001b]11;rgb:([0-9a-fA-F]+)\/([0-9a-fA-F]+)\/([0-9a-fA-F]+)$/
+      /^\u001b]11;rgb:([0-9a-fA-F]+)\/([0-9a-fA-F]+)\/([0-9a-fA-F]+)$/,
     );
     if (!match) return ko("Didn't recognize terminal bg color");
     const [r, g, b] = match
@@ -78,7 +78,7 @@ if (import.meta.hot) {
 
   import.meta.hot.accept("../tui/App.js", (mod) => {
     fullscreenApp.instance.rerender(
-      (mod.app as typeof app)({ db, bgColor, store })
+      (mod.app as typeof app)({ db, bgColor, store }),
     );
   });
 }

src/db/api/ApiInterface.ts

@@ -25,8 +25,11 @@ import type {
   CreateUser,
   UpdateUser,
 } from "../types/User.js";
+import { Readable } from "node:stream";
+import type { ReadableStream as WebReadableStream } from "node:stream/web";
+import type { Exportable, ExportOptions } from "../types/ExportImport.js";
 
-export class ApiInterface implements DbInterface {
+export class ApiInterface implements DbInterface, Exportable {
   #root: string;
   #headers: Record<string, string>;
   #readonly: boolean;
@@ -39,7 +42,7 @@ export class ApiInterface implements DbInterface {
     }: {
       headers?: Record<string, string>;
       readonly?: boolean;
-    } = {}
+    } = {},
   ) {
     if (root.endsWith("/")) root = root.slice(0, -1);
     this.#root = root;
@@ -82,7 +85,7 @@ export class ApiInterface implements DbInterface {
       params?: Record<string, string>;
       body?: unknown;
       headers?: Record<string, string>;
-    } = {}
+    } = {},
   ): Promise<T> {
     const resolvedHeaders = { ...this.#headers, ...headers };
     if (body !== undefined) {
@@ -247,7 +250,7 @@ export class ApiInterface implements DbInterface {
     });
   }
   async createApikey(
-    apikey: CreateApikey
+    apikey: CreateApikey,
   ): Promise<[ClientApikey, `at_${string}`]> {
     this.#checkReadonly();
     const { apikey: key, token } = await this.#call<{
@@ -296,4 +299,45 @@ export class ApiInterface implements DbInterface {
   async listNotesByUserId(uid: string): Promise<PartialNote[]> {
     return this.#call("GET", "/users/:uid/notes", { params: { uid } });
   }
+
+  export(options: ExportOptions = {}): NodeJS.ReadableStream {
+    // Streaming NDJSON bypasses the JSON-only `#call` helper: the raw
+    // `fetch` gets the caller's `signal` directly, so aborting cancels the
+    // underlying HTTP request itself.
+    const { filter, signal } = options;
+    const sp = new URLSearchParams();
+    if (filter?.kinds) sp.set("kinds", filter.kinds.join(","));
+    if (filter?.excludeKinds)
+      sp.set("excludeKinds", filter.excludeKinds.join(","));
+    if (filter?.abodes) sp.set("abodes", filter.abodes.join(","));
+    if (filter?.users) sp.set("users", filter.users.join(","));
+    const query = sp.toString();
+    const url = this.#root + "/export" + (query ? `?${query}` : "");
+    const headers = { ...this.#headers };
+
+    async function* generate(): AsyncGenerator<Buffer | Uint8Array> {
+      const res = await fetch(url, { method: "GET", headers, signal });
+      if (!res.ok) {
+        const text = await res.text();
+        switch (res.status) {
+          case 400:
+            throw new InvalidAbodeError();
+          case 401:
+            throw new NotAuthorizedAbodeError();
+          case 403:
+            throw new ReadonlyAbodeError();
+          case 404:
+            throw new NotFoundAbodeError();
+          case 409:
+            throw new ConflictAbodeError();
+          default:
+            throw new Error(`${res.status} ${res.statusText} ${text}`);
+        }
+      }
+      if (!res.body) return;
+      yield* Readable.fromWeb(res.body as WebReadableStream<Uint8Array>);
+    }
+
+    return Readable.from(generate());
+  }
 }

src/db/api/getdb.dyn.ts

@@ -3,7 +3,7 @@ import { apiProtocols } from "./url.js";
 
 const getApi = () =>
   import(/* webpackChunkName: 'dbsource-api' */ "./getdb.static.js").then(
-    (x) => x.default
+    (x) => x.default,
   );
 
 const getApiDynamic: GetDbDynamic = {

src/db/api/url.ts

@@ -17,7 +17,9 @@ export function parseApiUrl(url: string) {
   urlObj.href = urlObj.href.replace(/^abode\+/, "");
   const readonly = (urlObj.searchParams.get("readonly") ?? "0") !== "0";
   const headers = Object.fromEntries(
-    [...urlObj.searchParams.entries()].filter(([param]) => param !== "readonly")
+    [...urlObj.searchParams.entries()].filter(
+      ([param]) => param !== "readonly",
+    ),
   );
   if (urlObj.username) {
     headers["Authorization"] =
@@ -26,7 +28,7 @@ export function parseApiUrl(url: string) {
         [
           decodeURIComponent(urlObj.username),
           decodeURIComponent(urlObj.password),
-        ].join(":")
+        ].join(":"),
       );
     urlObj.username = "";
     urlObj.password = "";

src/db/dbSources.dyn.ts

@@ -15,7 +15,7 @@ export async function getDbSources(url: string): Promise<GetDbStatic[]> {
           .catch(() => null)
           .then((dbSource) => {
             if (dbSource) dbSources.push(dbSource);
-          })
+          }),
       );
     }
   }

src/db/dbSources.shared.ts

@@ -3,7 +3,7 @@ import type { GetDbStatic } from "./types/GetDb.js";
 let rawGetDbSources: typeof getDbSources | undefined = undefined;
 const getGetDbSources = () =>
   import(/* webpackChunkName: 'dbsources' */ "./dbSources.static.js").then(
-    (x) => x.getDbSources
+    (x) => x.getDbSources,
   );
 
 export async function getDbSources(url: string): Promise<GetDbStatic[]> {

src/db/export/filter.ts

@@ -0,0 +1,79 @@
+import type { ExportFilter, ExportKind } from "../types/ExportImport.js";
+
+const EXPORT_KINDS = new Set<ExportKind>([
+  "user",
+  "abode",
+  "resident",
+  "apikey",
+  "note",
+]);
+
+export function isExportKind(x: unknown): x is ExportKind {
+  return typeof x === "string" && EXPORT_KINDS.has(x as ExportKind);
+}
+
+/** Whether a `kind` survives a filter's `kinds`/`excludeKinds` rules. */
+export function kindAllowed(
+  filter: ExportFilter | undefined,
+  kind: ExportKind,
+): boolean {
+  if (!filter) return true;
+  if (filter.kinds && !filter.kinds.includes(kind)) return false;
+  if (filter.excludeKinds && filter.excludeKinds.includes(kind)) return false;
+  return true;
+}
+
+/**
+ * Whether an individual record passes a filter's `abodes`/`users` allowlists.
+ * `abodes` scopes abode/resident/note (by aid); `users` scopes user/apikey
+ * (by uid). An absent allowlist means "unrestricted".
+ */
+export function recordAllowed(
+  filter: ExportFilter | undefined,
+  kind: ExportKind,
+  record: { uid?: string; aid?: string },
+): boolean {
+  if (!filter) return true;
+  switch (kind) {
+    case "user":
+    case "apikey":
+      return !filter.users || filter.users.includes(record.uid as string);
+    case "abode":
+    case "resident":
+    case "note":
+      return !filter.abodes || filter.abodes.includes(record.aid as string);
+  }
+}
+
+function intersectList<T extends string>(a?: T[], b?: T[]): T[] | undefined {
+  if (!a) return b;
+  if (!b) return a;
+  const bs = new Set(b);
+  return a.filter((x) => bs.has(x));
+}
+
+function unionList<T extends string>(a?: T[], b?: T[]): T[] | undefined {
+  if (!a) return b;
+  if (!b) return a;
+  return [...new Set([...a, ...b])];
+}
+
+/**
+ * Combine two filters as a hard intersection: the result can never permit more
+ * than either input. An absent allowlist is treated as "unrestricted", so
+ * intersecting it with a present one yields the present one. `excludeKinds`
+ * are unioned (either exclusion still excludes).
+ */
+export function intersectExportFilters(
+  a: ExportFilter | null | undefined,
+  b: ExportFilter | null | undefined,
+): ExportFilter {
+  if (!a) return b ?? {};
+  if (!b) return a;
+  return {
+    kinds: intersectList(a.kinds, b.kinds),
+    excludeKinds: unionList(a.excludeKinds, b.excludeKinds),
+    abodes: intersectList(a.abodes, b.abodes),
+    users: intersectList(a.users, b.users),
+  };
+}

src/db/export/inspect.ts

@@ -0,0 +1,60 @@
+import readline from "node:readline";
+import type {
+  ExportFilter,
+  ExportKind,
+  ExportMeta,
+} from "../types/ExportImport.js";
+import { isExportKind } from "./filter.js";
+
+export type InspectResult = {
+  counts: Partial<Record<ExportKind, number>>;
+  meta?: Partial<ExportMeta> & { filter?: ExportFilter };
+};
+
+/**
+ * Tally the kinds/counts contained in an NDJSON export stream without ever
+ * touching a database. Works on any stream — a file, {@link ApiInterface}'s
+ * export, or a pipe straight from {@link SqliteInterface}'s export.
+ *
+ * If `stopAfterKinds` is given, reading stops as soon as at least one record of
+ * every requested kind has been seen, rather than draining to EOF — useful for
+ * probing large dumps ("does this contain notes at all?").
+ */
+export async function inspectExportStream(
+  source: NodeJS.ReadableStream,
+  options: { signal?: AbortSignal; stopAfterKinds?: ExportKind[] } = {},
+): Promise<InspectResult> {
+  const { signal, stopAfterKinds } = options;
+  const counts: Partial<Record<ExportKind, number>> = {};
+  let meta: InspectResult["meta"];
+
+  const rl = readline.createInterface({
+    input: source,
+    crlfDelay: Infinity,
+    signal,
+  });
+  try {
+    for await (const raw of rl) {
+      signal?.throwIfAborted();
+      const line = raw.trim();
+      if (!line) continue;
+      let parsed: { kind?: unknown; data?: unknown };
+      try {
+        parsed = JSON.parse(line);
+      } catch {
+        continue;
+      }
+      if (parsed.kind === "meta") {
+        meta = parsed.data as InspectResult["meta"];
+        continue;
+      }
+      if (!isExportKind(parsed.kind)) continue;
+      counts[parsed.kind] = (counts[parsed.kind] ?? 0) + 1;
+      if (stopAfterKinds && stopAfterKinds.every((k) => counts[k])) break;
+    }
+  } finally {
+    rl.close();
+  }
+
+  return { counts, meta };
+}

src/db/postgres/PostgresInterface.ts

@@ -92,7 +92,7 @@ export class PostgresInterface implements BackendDbInterface {
   async getUserByEmail(email: string): Promise<ClientUser> {
     const user = await selectClientUser(
       this.#db,
-      sql`u."email" = ${{ text: email }}`
+      sql`u."email" = ${{ text: email }}`,
     );
     if (!user) throw new NotFoundAbodeError();
     return user;
@@ -111,7 +111,7 @@ export class PostgresInterface implements BackendDbInterface {
         SELECT "uid", "email", "name", "flags", "created_at", "updated_at", "password"
         FROM "users"
         WHERE "email" = ${{ text: email }}
-      `
+      `,
     );
     if (!rawUser) throw new NotFoundAbodeError();
     if (rawUser.password.startsWith("#")) throw new ConflictAbodeError();
@@ -125,7 +125,7 @@ export class PostgresInterface implements BackendDbInterface {
       sql`
         DELETE FROM "users"
         WHERE "uid" = ${{ uuid: id }}
-      `
+      `,
     );
     if (!changes) throw new NotFoundAbodeError();
   }
@@ -145,10 +145,10 @@ export class PostgresInterface implements BackendDbInterface {
               ${{ text: user.password }},
               ${{ jsonb: user.flags }}
             )
-          `
+          `,
         );
         return this.#getUserById(uid, tx);
-      })
+      }),
     );
   }
   async updateUser(user: UpdateUser): Promise<ClientUser> {
@@ -161,7 +161,8 @@ export class PostgresInterface implements BackendDbInterface {
         if ("name" in user && user.name !== undefined)
           updates.push(sql`"name" = ${{ text: user.name }}`);
         if ("password" in user && user.password !== undefined) {
-          if (!isValidUserPassword(user.password)) throw new InvalidAbodeError();
+          if (!isValidUserPassword(user.password))
+            throw new InvalidAbodeError();
           if (user.password.startsWith("#")) {
             await tx.run(sql`
               DELETE FROM "apikeys"
@@ -185,11 +186,11 @@ export class PostgresInterface implements BackendDbInterface {
               "updated_at" = NOW(),
               ${joinSql(updates, sql`, `)}
             WHERE "uid" = ${{ uuid: user.uid }}
-          `
+          `,
         );
         if (!changes) throw new NotFoundAbodeError();
         return this.#getUserById(user.uid, tx);
-      })
+      }),
     );
   }
 
@@ -210,7 +211,7 @@ export class PostgresInterface implements BackendDbInterface {
       sql`
         DELETE FROM "abodes"
         WHERE "aid" = ${{ uuid: id }}
-      `
+      `,
     );
     if (!changes) throw new NotFoundAbodeError();
   }
@@ -228,10 +229,10 @@ export class PostgresInterface implements BackendDbInterface {
               ${{ uuid: ctx.uid }},
               ${{ uuid: ctx.uid }}
             )
-          `
+          `,
         );
         return this.#getAbodeById(aid, tx);
-      })
+      }),
     );
   }
   async updateAbode(abode: UpdateAbode, ctx: { uid: string }): Promise<Abode> {
@@ -250,11 +251,11 @@ export class PostgresInterface implements BackendDbInterface {
               "updated_by" = ${{ uuid: ctx.uid }},
               ${joinSql(updates, sql`, `)}
             WHERE "aid" = ${{ uuid: abode.aid }}
-          `
+          `,
         );
         if (!changes) throw new NotFoundAbodeError();
         return this.#getAbodeById(abode.aid, tx);
-      })
+      }),
     );
   }
 
@@ -270,11 +271,11 @@ export class PostgresInterface implements BackendDbInterface {
   async #getResidentById(
     uid: string,
     aid: string,
-    db: WrappedPgClient
+    db: WrappedPgClient,
   ): Promise<Resident> {
     const resident = await selectResident(
       db,
-      sql`"uid" = ${{ uuid: uid }} AND "aid" = ${{ uuid: aid }}`
+      sql`"uid" = ${{ uuid: uid }} AND "aid" = ${{ uuid: aid }}`,
     );
     if (!resident) throw new NotFoundAbodeError();
     return resident;
@@ -288,13 +289,13 @@ export class PostgresInterface implements BackendDbInterface {
       sql`
         DELETE FROM "residents"
         WHERE "uid" = ${{ uuid: uid }} AND "aid" = ${{ uuid: aid }}
-      `
+      `,
     );
     if (!changes) throw new NotFoundAbodeError();
   }
   async createResident(
     resident: CreateResident,
-    ctx: { uid: string }
+    ctx: { uid: string },
   ): Promise<Resident> {
     this.#checkReadonly();
     return this.#db.rethrow(() =>
@@ -309,15 +310,15 @@ export class PostgresInterface implements BackendDbInterface {
               ${{ uuid: ctx.uid }},
               ${{ uuid: ctx.uid }}
             )
-          `
+          `,
         );
         return this.#getResidentById(resident.uid, resident.aid, tx);
-      })
+      }),
     );
   }
   async updateResident(
     resident: updateResident,
-    ctx: { uid: string }
+    ctx: { uid: string },
   ): Promise<Resident> {
     this.#checkReadonly();
     const updates = calcUpdates({
@@ -336,11 +337,11 @@ export class PostgresInterface implements BackendDbInterface {
             WHERE
               "uid" = ${{ uuid: resident.uid }}
               AND "aid" = ${{ uuid: resident.aid }}
-          `
+          `,
         );
         if (!changes) throw new NotFoundAbodeError();
         return this.#getResidentById(resident.uid, resident.aid, tx);
-      })
+      }),
     );
   }
 
@@ -350,7 +351,7 @@ export class PostgresInterface implements BackendDbInterface {
       sql`
         JOIN "residents" r ON u."uid" = r."uid"
         WHERE r."aid" = ${{ uuid: id }}
-      `
+      `,
     );
   }
   async listAbodesByUserId(id: string): Promise<Abode[]> {
@@ -359,7 +360,7 @@ export class PostgresInterface implements BackendDbInterface {
       sql`
         JOIN "residents" r ON a."aid" = r."aid"
         WHERE r."uid" = ${{ uuid: id }}
-      `
+      `,
     );
   }
 
@@ -418,17 +419,17 @@ export class PostgresInterface implements BackendDbInterface {
 
   async #getApikeyByToken(
     token: `at_${string}`,
-    db: WrappedPgClient
+    db: WrappedPgClient,
   ): Promise<ClientApikey> {
     const apikey = await selectClientApikey(
       db,
-      sql`k."token" = ${{ text: token }}`
+      sql`k."token" = ${{ text: token }}`,
     );
     if (!apikey) throw new NotFoundAbodeError();
     return apikey;
   }
   async getUserByApikey(
-    token: `at_${string}`
+    token: `at_${string}`,
   ): Promise<[ClientUser, ClientApikey]> {
     const apikey = await this.#getApikeyByToken(token, this.#db);
     if (
@@ -445,13 +446,13 @@ export class PostgresInterface implements BackendDbInterface {
   async getApikeyById(kid: string): Promise<ClientApikey> {
     const apikey = await selectClientApikey(
       this.#db,
-      sql`k."kid" = ${{ uuid: kid }}`
+      sql`k."kid" = ${{ uuid: kid }}`,
     );
     if (!apikey) throw new NotFoundAbodeError();
     return apikey;
   }
   async createApikey(
-    apikey: CreateApikey
+    apikey: CreateApikey,
   ): Promise<[ClientApikey, `at_${string}`]> {
     this.#checkReadonly();
     const token = createApikeyToken();
@@ -459,7 +460,7 @@ export class PostgresInterface implements BackendDbInterface {
     let expires = apikey.expires_at;
     if (expires === undefined)
       expires = new Date(
-        new Date().getTime() + 1000 * 60 * 60 * 24 * 365
+        new Date().getTime() + 1000 * 60 * 60 * 24 * 365,
       ).toISOString();
     if (expires && new Date(expires).getTime() < Date.now())
       throw new InvalidAbodeError();

src/db/postgres/PostgresMigrator.ts

@@ -24,7 +24,7 @@ export class PostgresMigrator implements Migrator {
         `SELECT EXISTS (
           SELECT 1 FROM information_schema.tables
           WHERE table_schema = 'public' AND table_name = '_migrations'
-        ) AS "exists"`
+        ) AS "exists"`,
       );
       if (!existsResult.rows[0]?.exists) return null;
 
@@ -33,7 +33,7 @@ export class PostgresMigrator implements Migrator {
         name: string;
         applied_at: Date;
       }>(
-        `SELECT "id", "name", "applied_at" FROM "_migrations" ORDER BY "id" ASC`
+        `SELECT "id", "name", "applied_at" FROM "_migrations" ORDER BY "id" ASC`,
       );
       return result.rows.map((x) => ({
         ...x,
@@ -73,17 +73,16 @@ export class PostgresMigrator implements Migrator {
         throw new Error(`Applied migration ${id} (${name}) not known`);
       if (migration.name !== name)
         throw new Error(
-          `Applied migration ${id} (${name}) has a different name from expected (${migration.name})`
+          `Applied migration ${id} (${name}) has a different name from expected (${migration.name})`,
         );
     }
 
-    const start =
-      migrations.findIndex((x) => x.id === current.at(-1)?.id) + 1;
+    const start = migrations.findIndex((x) => x.id === current.at(-1)?.id) + 1;
     const end = migrations.indexOf(target) + 1;
 
     if (end < start) {
       throw new Error(
-        `Cannot migrate backward, at ${current.at(-1)?.id ?? 0}, going to ${target.id}`
+        `Cannot migrate backward, at ${current.at(-1)?.id ?? 0}, going to ${target.id}`,
       );
     }
 

src/db/postgres/pool.ts

@@ -31,9 +31,7 @@ async function rethrow<R>(fn: () => Promise<R>): Promise<R> {
 
 // Rollback on a broken connection can itself throw; the original error is
 // the one worth surfacing.
-export async function rollbackQuietly(
-  client: pg.PoolClient
-): Promise<void> {
+export async function rollbackQuietly(client: pg.PoolClient): Promise<void> {
   try {
     await client.query("ROLLBACK");
   } catch {}
@@ -58,7 +56,7 @@ abstract class WrappedPgBase implements WrappedPgClient {
   async all<R>(stmt: SqlCode): Promise<R[]> {
     const result = await this.#queryable.query(
       toPositional(stmt._sql),
-      stmt._vars
+      stmt._vars,
     );
     return result.rows as R[];
   }
@@ -72,7 +70,7 @@ abstract class WrappedPgBase implements WrappedPgClient {
   async run(stmt: SqlCode): Promise<{ changes: number }> {
     const result = await this.#queryable.query(
       toPositional(stmt._sql),
-      stmt._vars
+      stmt._vars,
     );
     return { changes: result.rowCount ?? 0 };
   }

src/db/postgres/query.ts

@@ -26,20 +26,18 @@ const sqlClientUser = sql`
 
 export async function selectClientUser(
   db: WrappedPgClient,
-  where: SqlCode
+  where: SqlCode,
 ): Promise<ClientUser | null> {
-  const raw = await db.get<RawClientUser>(
-    sql`${sqlClientUser} WHERE ${where}`
-  );
+  const raw = await db.get<RawClientUser>(sql`${sqlClientUser} WHERE ${where}`);
   if (raw) return pgToClientUser(raw);
   return null;
 }
 export async function selectClientUsers(
   db: WrappedPgClient,
-  rest?: SqlCode
+  rest?: SqlCode,
 ): Promise<ClientUser[]> {
   const rows = await db.all<RawClientUser>(
-    rest ? sql`${sqlClientUser} ${rest}` : sqlClientUser
+    rest ? sql`${sqlClientUser} ${rest}` : sqlClientUser,
   );
   return rows.map(pgToClientUser);
 }
@@ -59,7 +57,7 @@ const sqlAbode = sql`
 
 export async function selectAbode(
   db: WrappedPgClient,
-  where: SqlCode
+  where: SqlCode,
 ): Promise<Abode | null> {
   const raw = await db.get<RawAbode>(sql`${sqlAbode} WHERE ${where}`);
   if (raw) return pgToAbode(raw);
@@ -67,10 +65,10 @@ export async function selectAbode(
 }
 export async function selectAbodes(
   db: WrappedPgClient,
-  rest?: SqlCode
+  rest?: SqlCode,
 ): Promise<Abode[]> {
   const rows = await db.all<RawAbode>(
-    rest ? sql`${sqlAbode} ${rest}` : sqlAbode
+    rest ? sql`${sqlAbode} ${rest}` : sqlAbode,
   );
   return rows.map(pgToAbode);
 }
@@ -91,7 +89,7 @@ const sqlResident = sql`
 
 export async function selectResident(
   db: WrappedPgClient,
-  where: SqlCode
+  where: SqlCode,
 ): Promise<Resident | null> {
   const raw = await db.get<RawResident>(sql`${sqlResident} WHERE ${where}`);
   if (raw) return pgToResident(raw);
@@ -99,10 +97,10 @@ export async function selectResident(
 }
 export async function selectResidents(
   db: WrappedPgClient,
-  where?: SqlCode
+  where?: SqlCode,
 ): Promise<Resident[]> {
   const rows = await db.all<RawResident>(
-    where ? sql`${sqlResident} WHERE ${where}` : sqlResident
+    where ? sql`${sqlResident} WHERE ${where}` : sqlResident,
   );
   return rows.map(pgToResident);
 }
@@ -122,20 +120,20 @@ const sqlClientApikey = sql`
 
 export async function selectClientApikey(
   db: WrappedPgClient,
-  where: SqlCode
+  where: SqlCode,
 ): Promise<ClientApikey | null> {
   const raw = await db.get<RawClientApikey>(
-    sql`${sqlClientApikey} WHERE ${where}`
+    sql`${sqlClientApikey} WHERE ${where}`,
   );
   if (raw) return pgToClientApikey(raw);
   return null;
 }
 export async function selectClientApikeys(
   db: WrappedPgClient,
-  where: SqlCode
+  where: SqlCode,
 ): Promise<ClientApikey[]> {
   const rows = await db.all<RawClientApikey>(
-    sql`${sqlClientApikey} WHERE ${where}`
+    sql`${sqlClientApikey} WHERE ${where}`,
   );
   return rows.map(pgToClientApikey);
 }

src/db/postgres/sql.ts

@@ -65,7 +65,7 @@ export function calcUpdates<T extends object>(updater: {
     for (const [prop, update] of Object.entries(updater)) {
       if (prop in obj) {
         updates.push(
-          (update as (value: unknown) => SqlCode)(obj[prop as keyof T]!)
+          (update as (value: unknown) => SqlCode)(obj[prop as keyof T]!),
         );
       }
     }

src/db/postgres/url.ts

@@ -9,7 +9,10 @@ export function isPgUrl(url: string): boolean {
   }
 }
 
-export function parsePgUrl(url: string): { connectionString: string; readonly: boolean } {
+export function parsePgUrl(url: string): {
+  connectionString: string;
+  readonly: boolean;
+} {
   if (!isPgUrl(url)) throw new Error("Not a postgres: URL");
   const urlObj = new URL(url);
   const readonly = (urlObj.searchParams.get("readonly") ?? "0") !== "0";

src/db/sqlite/SqliteInterface.ts

@@ -34,6 +34,7 @@ import {
   selectClientUser,
   selectClientUsers,
   selectNote,
+  selectNotes,
   selectPartialNotes,
   selectResident,
   selectResidents,
@@ -45,8 +46,21 @@ import type {
   UpdateNote,
 } from "../types/Note.js";
 import type { WrappedDb } from "./impl/types.js";
+import { Readable } from "node:stream";
+import readline from "node:readline";
+import type {
+  Exportable,
+  ExportKind,
+  ExportOptions,
+  Importable,
+  ImportOptions,
+  ImportResult,
+} from "../types/ExportImport.js";
+import { isExportKind, kindAllowed, recordAllowed } from "../export/filter.js";
 
-export class SqliteInterface implements BackendDbInterface {
+export class SqliteInterface
+  implements BackendDbInterface, Exportable, Importable
+{
   #db: WrappedDb;
 
   constructor(db: WrappedDb) {
@@ -110,7 +124,7 @@ export class SqliteInterface implements BackendDbInterface {
         SELECT "uid", "email", "name", json("flags") AS "flags", "created_at", "updated_at", "password"
         FROM "users"
         WHERE "email" = ${{ text: email }}
-      `
+      `,
     );
     if (!rawUser) throw new NotFoundAbodeError();
     if (rawUser.password.startsWith("#")) throw new ConflictAbodeError();
@@ -124,7 +138,7 @@ export class SqliteInterface implements BackendDbInterface {
       sql`
         DELETE FROM "users"
         WHERE "uid" = ${{ uuid: id }}
-      `
+      `,
     );
     if (!changes) throw new NotFoundAbodeError();
   }
@@ -142,10 +156,10 @@ export class SqliteInterface implements BackendDbInterface {
               ${{ text: user.email }},
               ${{ text: user.name }},
               ${{ text: user.password }},${{ jsonb: user.flags }})
-          `
+          `,
         );
         return this.#getUserById(uid);
-      })
+      }),
     );
   }
   async updateUser(user: UpdateUser): Promise<ClientUser> {
@@ -179,11 +193,11 @@ export class SqliteInterface implements BackendDbInterface {
               "updated_at" = datetime('now', 'localtime', 'subsec'),
               ${joinSql(updates, sql`, `)}
             WHERE "uid" = ${{ uuid: user.uid }}
-          `
+          `,
         );
         if (!changes) throw new NotFoundAbodeError();
         return this.#getUserById(user.uid);
-      })
+      }),
     );
   }
 
@@ -204,7 +218,7 @@ export class SqliteInterface implements BackendDbInterface {
       sql`
         DELETE FROM "abodes"
         WHERE "aid" = ${{ uuid: id }}
-      `
+      `,
     );
     if (!changes) throw new NotFoundAbodeError();
   }
@@ -222,10 +236,10 @@ export class SqliteInterface implements BackendDbInterface {
               ${{ uuid: ctx.uid }},
               ${{ uuid: ctx.uid }}
             )
-          `
+          `,
         );
         return this.#getAbodeById(aid);
-      })
+      }),
     );
   }
   async updateAbode(abode: UpdateAbode, ctx: { uid: string }): Promise<Abode> {
@@ -244,11 +258,11 @@ export class SqliteInterface implements BackendDbInterface {
               "updated_by" = ${{ uuid: ctx.uid }},
               ${joinSql(updates, sql`, `)}
             WHERE "aid" = ${{ uuid: abode.aid }}
-          `
+          `,
         );
         if (!changes) throw new NotFoundAbodeError();
         return this.#getAbodeById(abode.aid);
-      })
+      }),
     );
   }
 
@@ -264,7 +278,7 @@ export class SqliteInterface implements BackendDbInterface {
   #getResidentById(uid: string, aid: string): Resident {
     const resident = selectResident(
       this.#db,
-      sql`"uid" = ${{ uuid: uid }} AND "aid" = ${{ uuid: aid }}`
+      sql`"uid" = ${{ uuid: uid }} AND "aid" = ${{ uuid: aid }}`,
     );
     if (!resident) throw new NotFoundAbodeError();
     return resident;
@@ -278,13 +292,13 @@ export class SqliteInterface implements BackendDbInterface {
       sql`
         DELETE FROM "residents"
         WHERE "uid" = ${{ uuid: uid }} AND "aid" = ${{ uuid: aid }}
-      `
+      `,
     );
     if (!changes) throw new NotFoundAbodeError();
   }
   async createResident(
     resident: CreateResident,
-    ctx: { uid: string }
+    ctx: { uid: string },
   ): Promise<Resident> {
     this.#checkReadonly();
     return this.#db.rethrow(() =>
@@ -299,15 +313,15 @@ export class SqliteInterface implements BackendDbInterface {
               ${{ uuid: ctx.uid }},
               ${{ uuid: ctx.uid }}
             )
-          `
+          `,
         );
         return this.#getResidentById(resident.uid, resident.aid);
-      })
+      }),
     );
   }
   async updateResident(
     resident: updateResident,
-    ctx: { uid: string }
+    ctx: { uid: string },
   ): Promise<Resident> {
     this.#checkReadonly();
     const updates = calcUpdates({
@@ -326,11 +340,11 @@ export class SqliteInterface implements BackendDbInterface {
             WHERE
               "uid" = ${{ uuid: resident.uid }}
               AND "aid" = ${{ uuid: resident.aid }}
-          `
+          `,
         );
         if (!changes) throw new NotFoundAbodeError();
         return this.#getResidentById(resident.uid, resident.aid);
-      })
+      }),
     );
   }
 
@@ -340,7 +354,7 @@ export class SqliteInterface implements BackendDbInterface {
       sql`
         JOIN "residents" r ON u."uid" = r."uid"
         WHERE r."aid" = ${{ uuid: id }}
-      `
+      `,
     );
   }
   async listAbodesByUserId(id: string): Promise<Abode[]> {
@@ -349,7 +363,7 @@ export class SqliteInterface implements BackendDbInterface {
       sql`
         JOIN "residents" r ON a."aid" = r."aid"
         WHERE r."uid" = ${{ uuid: id }}
-      `
+      `,
     );
   }
 
@@ -405,13 +419,13 @@ export class SqliteInterface implements BackendDbInterface {
   #getApikeyByToken(token: `at_${string}`): ClientApikey {
     const apikey = selectClientApikey(
       this.#db,
-      sql`"token" = ${{ text: token }}`
+      sql`"token" = ${{ text: token }}`,
     );
     if (!apikey) throw new NotFoundAbodeError();
     return apikey;
   }
   async getUserByApikey(
-    token: `at_${string}`
+    token: `at_${string}`,
   ): Promise<[ClientUser, ClientApikey]> {
     const apikey = this.#getApikeyByToken(token);
     if (
@@ -431,7 +445,7 @@ export class SqliteInterface implements BackendDbInterface {
     return apikey;
   }
   async createApikey(
-    apikey: CreateApikey
+    apikey: CreateApikey,
   ): Promise<[ClientApikey, `at_${string}`]> {
     this.#checkReadonly();
     const token = createApikeyToken();
@@ -439,7 +453,7 @@ export class SqliteInterface implements BackendDbInterface {
     let expires = apikey.expires_at;
     if (expires === undefined)
       expires = new Date(
-        new Date().getTime() + 1000 * 60 * 60 * 24 * 365
+        new Date().getTime() + 1000 * 60 * 60 * 24 * 365,
       ).toISOString();
     if (expires && new Date(expires).getTime() < Date.now())
       throw new InvalidAbodeError();
@@ -480,7 +494,7 @@ export class SqliteInterface implements BackendDbInterface {
   async deleteNoteById(nid: string): Promise<void> {
     this.#checkReadonly();
     const { changes } = this.#db.run(
-      sql`DELETE FROM "notes" WHERE "nid" = ${{ uuid: nid }}`
+      sql`DELETE FROM "notes" WHERE "nid" = ${{ uuid: nid }}`,
     );
     if (!changes) throw new NotFoundAbodeError();
   }
@@ -502,7 +516,7 @@ export class SqliteInterface implements BackendDbInterface {
           )
         `);
         return this.#getNoteById(nid);
-      })
+      }),
     );
   }
   async updateNote(note: UpdateNote, ctx: { uid: string }): Promise<Note> {
@@ -525,7 +539,7 @@ export class SqliteInterface implements BackendDbInterface {
         `);
         if (!changes) throw new NotFoundAbodeError();
         return this.#getNoteById(note.nid);
-      })
+      }),
     );
   }
   async listNotesByAbodeId(aid: string): Promise<PartialNote[]> {
@@ -534,4 +548,219 @@ export class SqliteInterface implements BackendDbInterface {
   async listNotesByUserId(uid: string): Promise<PartialNote[]> {
     return selectPartialNotes(this.#db, sql`n."created_by" = ${{ uuid: uid }}`);
   }
+
+  export(options: ExportOptions = {}): NodeJS.ReadableStream {
+    const { filter, signal } = options;
+    const db = this.#db;
+    const source = this.name;
+
+    // Per-table full materialization + JS-side per-record yielding (each
+    // `load()` is exactly one `WrappedDb.all()`). Kept lazy so the first query
+    // only fires once the destination starts pulling, and skipped entirely
+    // once the signal is aborted — no further reads after the destination
+    // goes away.
+    const tables: [ExportKind, () => { uid?: string; aid?: string }[]][] = [
+      ["user", () => selectClientUsers(db)],
+      ["abode", () => selectAbodes(db)],
+      ["resident", () => selectResidents(db)],
+      ["apikey", () => selectClientApikeys(db)],
+      ["note", () => selectNotes(db)],
+    ];
+
+    async function* generate(): AsyncGenerator<string> {
+      if (signal?.aborted) return;
+      yield JSON.stringify({
+        kind: "meta",
+        data: {
+          v: 1,
+          exportedAt: new Date().toISOString(),
+          source,
+          filter: filter ?? {},
+        },
+      }) + "\n";
+      try {
+        for (const [kind, load] of tables) {
+          if (signal?.aborted) return;
+          if (!kindAllowed(filter, kind)) continue;
+          for (const row of load()) {
+            if (signal?.aborted) return;
+            if (recordAllowed(filter, kind, row)) {
+              yield JSON.stringify({ kind, data: row }) + "\n";
+            }
+          }
+        }
+      } catch (e) {
+        // Aborts unwind via early `return`, never here; a genuine mid-stream
+        // failure is surfaced as a trailing sentinel line (HTTP 200 headers
+        // are already flushed, so `convertError` can no longer apply).
+        if (signal?.aborted) return;
+        yield JSON.stringify({
+          kind: "error",
+          data: {
+            message: e instanceof Error ? e.message : String(e),
+            code: e instanceof Error ? e.name : undefined,
+          },
+        }) + "\n";
+      }
+    }
+
+    return Readable.from(generate());
+  }
+
+  async import(
+    source: NodeJS.ReadableStream,
+    options: ImportOptions = {},
+  ): Promise<ImportResult> {
+    this.#checkReadonly();
+    const { filter, signal } = options;
+    const db = this.#db;
+    const counts: Partial<Record<ExportKind, number>> = {};
+
+    const rl = readline.createInterface({
+      input: source,
+      crlfDelay: Infinity,
+      signal,
+    });
+
+    // Bulk restore trusts the export's referential integrity, and a filtered
+    // dump may legitimately reference `created_by`/`updated_by` users outside
+    // its scope. Suppress FK enforcement for the duration (can only be toggled
+    // outside a transaction) and restore it in `finally`.
+    db.run(sql`PRAGMA foreign_keys = OFF`);
+    db.run(sql`BEGIN`);
+    try {
+      for await (const raw of rl) {
+        signal?.throwIfAborted();
+        const line = raw.trim();
+        if (!line) continue;
+        let parsed: { kind?: unknown; data?: unknown };
+        try {
+          parsed = JSON.parse(line);
+        } catch {
+          throw new InvalidAbodeError();
+        }
+        if (parsed.kind === "meta") continue;
+        if (parsed.kind === "error") {
+          throw new Error(
+            `export stream reported an error: ${
+              (parsed.data as { message?: string })?.message ?? "unknown"
+            }`,
+          );
+        }
+        if (!isExportKind(parsed.kind)) continue;
+        if (!kindAllowed(filter, parsed.kind)) continue;
+        const data = parsed.data as { uid?: string; aid?: string };
+        if (!recordAllowed(filter, parsed.kind, data)) continue;
+        this.#importRecord(parsed.kind, parsed.data);
+        counts[parsed.kind] = (counts[parsed.kind] ?? 0) + 1;
+      }
+      // An abort while blocked on the source closes readline without throwing,
+      // so re-check before committing to guarantee no partial commit.
+      signal?.throwIfAborted();
+      db.run(sql`COMMIT`);
+    } catch (e) {
+      try {
+        db.run(sql`ROLLBACK`);
+      } catch {
+        /* already rolled back */
+      }
+      throw e;
+    } finally {
+      rl.close();
+      db.run(sql`PRAGMA foreign_keys = ON`);
+    }
+
+    return { counts };
+  }
+
+  #importRecord(kind: ExportKind, data: unknown): void {
+    const db = this.#db;
+    switch (kind) {
+      case "user": {
+        const u = data as ClientUser;
+        // `password` is never exported; imported users land on the schema
+        // default ('#unset') and must reset before they can log in.
+        db.run(sql`
+          INSERT INTO "users"("uid", "email", "name", "flags", "created_at", "updated_at")
+          VALUES(
+            ${{ uuid: u.uid }},
+            ${{ text: u.email }},
+            ${{ text: u.name }},
+            ${{ jsonb: u.flags }},
+            ${{ date: u.created_at }},
+            ${{ date: u.updated_at }}
+          )
+        `);
+        break;
+      }
+      case "abode": {
+        const a = data as Abode;
+        db.run(sql`
+          INSERT INTO "abodes"("aid", "name", "created_at", "created_by", "updated_at", "updated_by")
+          VALUES(
+            ${{ uuid: a.aid }},
+            ${{ text: a.name }},
+            ${{ date: a.created_at }},
+            ${a.created_by ? { uuid: a.created_by } : { null: true }},
+            ${{ date: a.updated_at }},
+            ${a.updated_by ? { uuid: a.updated_by } : { null: true }}
+          )
+        `);
+        break;
+      }
+      case "resident": {
+        const r = data as Resident;
+        db.run(sql`
+          INSERT INTO "residents"("uid", "aid", "flags", "created_at", "created_by", "updated_at", "updated_by")
+          VALUES(
+            ${{ uuid: r.uid }},
+            ${{ uuid: r.aid }},
+            ${{ jsonb: r.flags }},
+            ${{ date: r.created_at }},
+            ${r.created_by ? { uuid: r.created_by } : { null: true }},
+            ${{ date: r.updated_at }},
+            ${r.updated_by ? { uuid: r.updated_by } : { null: true }}
+          )
+        `);
+        break;
+      }
+      case "apikey": {
+        const k = data as ClientApikey;
+        // `token` is never exported; mint a fresh unique one so the record's
+        // metadata (kid/permissions/expiry) survives even though the original
+        // secret cannot.
+        db.run(sql`
+          INSERT INTO "apikeys"("uid", "kid", "token", "name", "permissions", "created_at", "expires_at")
+          VALUES(
+            ${{ uuid: k.uid }},
+            ${{ uuid: k.kid }},
+            ${{ text: createApikeyToken() }},
+            ${{ text: k.name }},
+            ${{ jsonb: k.permissions }},
+            ${{ date: k.created_at }},
+            ${k.expires_at ? { date: k.expires_at } : { null: true }}
+          )
+        `);
+        break;
+      }
+      case "note": {
+        const n = data as Note;
+        db.run(sql`
+          INSERT INTO "notes"("nid", "aid", "name", "content", "properties", "created_at", "created_by", "updated_at", "updated_by")
+          VALUES(
+            ${{ uuid: n.nid }},
+            ${{ uuid: n.aid }},
+            ${{ text: n.name }},
+            ${{ text: n.content ?? "" }},
+            ${{ jsonb: n.properties }},
+            ${{ date: n.created_at }},
+            ${n.created_by ? { uuid: n.created_by } : { null: true }},
+            ${{ date: n.updated_at }},
+            ${n.updated_by ? { uuid: n.updated_by } : { null: true }}
+          )
+        `);
+        break;
+      }
+    }
+  }
 }

src/db/sqlite/SqliteMigrator.ts

@@ -16,12 +16,11 @@ export class SqliteMigrator implements Migrator {
   }
 
   #listAppliedMigrations():
-    | { id: number; name: string; applied_at: string }[]
-    | null {
+    { id: number; name: string; applied_at: string }[] | null {
     try {
       return this.#db
         .all<{ id: number; name: string; applied_at: string }>(
-          sql`SELECT "id", "name", "applied_at" FROM "_migrations" ORDER BY "id" ASC`
+          sql`SELECT "id", "name", "applied_at" FROM "_migrations" ORDER BY "id" ASC`,
         )
         .map((x) => ({ ...x, applied_at: sqliteToDate(x.applied_at) }));
     } catch (e) {
@@ -59,7 +58,7 @@ export class SqliteMigrator implements Migrator {
         throw new Error(`Applied migration ${id} (${name}) not known`);
       if (migration.name !== name)
         throw new Error(
-          `Applied migration ${id} (${name}) has a different name from expected (${migration.name})`
+          `Applied migration ${id} (${name}) has a different name from expected (${migration.name})`,
         );
     }
 
@@ -70,7 +69,7 @@ export class SqliteMigrator implements Migrator {
       throw new Error(
         `Cannot migrate backward, at ${current.at(-1)?.id ?? 0}, going to ${
           target.id
-        }`
+        }`,
       );
     }
 
@@ -94,7 +93,7 @@ export class SqliteMigrator implements Migrator {
           sql`
             INSERT INTO "_migrations"("id", "name")
             VALUES (${{ int: migration.id }}, ${{ text: migration.name }})
-          `
+          `,
         );
         this.#db.run(sql`COMMIT`);
       } catch (e) {

src/db/sqlite/cast.ts

@@ -22,7 +22,7 @@ export function uuidToSqlite(uuid: string) {
 }
 export function sqliteToUuid(uuid: Buffer | Uint8Array) {
   const hex = (uuid instanceof Buffer ? uuid : Buffer.from(uuid)).toString(
-    "hex"
+    "hex",
   );
   return [
     hex.slice(0, 8),
@@ -126,7 +126,7 @@ export function sqliteToResident(resident: {
 
 const defaultApikeyPermissions: ApikeyPermissions = {};
 export function sqliteToApikeyPermissions(
-  permissions: string
+  permissions: string,
 ): ApikeyPermissions {
   const parsed = JSON.parse(permissions);
   const out = { ...defaultApikeyPermissions };
@@ -184,7 +184,7 @@ export function sqliteToNoteProperties(props: string): NoteProperties {
 }
 
 export function sqliteToPartialNoteProperties(
-  props: string
+  props: string,
 ): PartialNoteProperties {
   const base = sqliteToNoteProperties(props);
   return { type: base.type ?? "note" };

src/db/sqlite/getdb.dyn.ts

@@ -3,7 +3,7 @@ import { sqliteProtocols } from "./url.js";
 
 const getSqlite = () =>
   import(/* webpackChunkName: 'dbsource-sqlite' */ "./getdb.static.js").then(
-    (x) => x.default
+    (x) => x.default,
   );
 
 const getSqliteDynamic: GetDbDynamic = {

src/db/sqlite/impl/better-sqlite3.ts

@@ -6,7 +6,7 @@ import type { WrappedDb, WrappedDbOptions } from "./types.js";
 
 function getDatabase(
   path: string,
-  options?: Omit<sqlite.Options, "nativeBinding">
+  options?: Omit<sqlite.Options, "nativeBinding">,
 ): sqlite.Database {
   if (!natives.sqlite) throw new Error("No natives found for better-sqlite3");
   options = { ...options };

src/db/sqlite/impl/index.ts

@@ -4,7 +4,7 @@ import { node, bs3 } from "./implementations.js";
 export function getWrappedDb(
   kind: "any" | "node" | "bs3",
   path: string,
-  options: WrappedDbOptions
+  options: WrappedDbOptions,
 ): WrappedDb {
   if (kind === "node") {
     if (!node) throw new Error("Requesting unavailable node backend");

src/db/sqlite/query.ts

@@ -29,7 +29,7 @@ const sqlClientUser = sql`
 
 export function selectClientUser(
   db: WrappedDb,
-  where: SqlCode
+  where: SqlCode,
 ): ClientUser | null {
   const rawUser = db.get<RawClientUser>(sql`${sqlClientUser} WHERE ${where}`);
   if (rawUser) return sqliteToClientUser(rawUser);
@@ -37,7 +37,7 @@ export function selectClientUser(
 }
 export function selectClientUsers(db: WrappedDb, rest?: SqlCode): ClientUser[] {
   const rawUsers = db.all<RawClientUser>(
-    rest ? sql`${sqlClientUser} ${rest}` : sqlClientUser
+    rest ? sql`${sqlClientUser} ${rest}` : sqlClientUser,
   );
   return rawUsers.map(sqliteToClientUser);
 }
@@ -62,7 +62,7 @@ export function selectAbode(db: WrappedDb, where: SqlCode): Abode | null {
 }
 export function selectAbodes(db: WrappedDb, rest?: SqlCode): Abode[] {
   const rawAbodes = db.all<RawAbode>(
-    rest ? sql`${sqlAbode} ${rest}` : sqlAbode
+    rest ? sql`${sqlAbode} ${rest}` : sqlAbode,
   );
   return rawAbodes.map(sqliteToAbode);
 }
@@ -88,7 +88,7 @@ export function selectResident(db: WrappedDb, where: SqlCode): Resident | null {
 }
 export function selectResidents(db: WrappedDb, where?: SqlCode): Resident[] {
   const rawResidents = db.all<RawResident>(
-    where ? sql`${sqlResident} WHERE ${where}` : sqlResident
+    where ? sql`${sqlResident} WHERE ${where}` : sqlResident,
   );
   return rawResidents.map(sqliteToResident);
 }
@@ -108,20 +108,20 @@ const sqlClientApikey = sql`
 
 export function selectClientApikey(
   db: WrappedDb,
-  where: SqlCode
+  where: SqlCode,
 ): ClientApikey | null {
   const rawApikey = db.get<RawClientApikey>(
-    sql`${sqlClientApikey} WHERE ${where}`
+    sql`${sqlClientApikey} WHERE ${where}`,
   );
   if (rawApikey) return sqliteToClientApikey(rawApikey);
   return null;
 }
 export function selectClientApikeys(
   db: WrappedDb,
-  where: SqlCode
+  where?: SqlCode,
 ): ClientApikey[] {
   const rawApikeys = db.all<RawClientApikey>(
-    sql`${sqlClientApikey} WHERE ${where}`
+    where ? sql`${sqlClientApikey} WHERE ${where}` : sqlClientApikey,
   );
   return rawApikeys.map(sqliteToClientApikey);
 }
@@ -156,15 +156,17 @@ export function selectNote(db: WrappedDb, where: SqlCode): Note | null {
   return null;
 }
 export function selectNotes(db: WrappedDb, where?: SqlCode): Note[] {
-  const raws = db.all<RawNote>(where ? sql`${sqlNote} WHERE ${where}` : sqlNote);
+  const raws = db.all<RawNote>(
+    where ? sql`${sqlNote} WHERE ${where}` : sqlNote,
+  );
   return raws.map(sqliteToNote);
 }
 export function selectPartialNotes(
   db: WrappedDb,
-  where?: SqlCode
+  where?: SqlCode,
 ): PartialNote[] {
   const raws = db.all<RawPartialNote>(
-    where ? sql`${sqlPartialNote} WHERE ${where}` : sqlPartialNote
+    where ? sql`${sqlPartialNote} WHERE ${where}` : sqlPartialNote,
   );
   return raws.map(sqliteToPartialNote);
 }

src/db/sqlite/sql.ts

@@ -65,7 +65,7 @@ export function calcUpdates<T extends object>(updater: {
     for (const [prop, update] of Object.entries(updater)) {
       if (prop in obj) {
         updates.push(
-          (update as (value: unknown) => SqlCode)(obj[prop as keyof T]!)
+          (update as (value: unknown) => SqlCode)(obj[prop as keyof T]!),
         );
       }
     }

src/db/sqlite/url.ts

@@ -27,7 +27,7 @@ export function isSqliteUrl(url: string) {
 }
 
 export function parseSqliteUrl(
-  url: string
+  url: string,
 ): ["any" | "node" | "bs3", string, WrappedDbOptions] {
   if (!isSqliteUrl(url)) throw new Error("Not sqlite: protocol");
   const urlObj = new URL(url);
@@ -39,7 +39,7 @@ export function parseSqliteUrl(
     urlObj.protocol === "node+sqlite:"
       ? "node"
       : urlObj.protocol === "bs3+sqlite:"
-      ? "bs3"
-      : "any";
+        ? "bs3"
+        : "any";
   return [kind, urlObj.pathname, options];
 }

src/db/types/DbInterface.ts

@@ -40,11 +40,11 @@ export interface DbInterface {
   deleteResidentById(uid: string, aid: string): Promise<void>;
   createResident(
     resident: CreateResident,
-    ctx: { uid: string }
+    ctx: { uid: string },
   ): Promise<Resident>;
   updateResident(
     resident: updateResident,
-    ctx: { uid: string }
+    ctx: { uid: string },
   ): Promise<Resident>;
 
   // list residents by member
@@ -104,7 +104,7 @@ export function isBackendInterface(db: DbInterface): db is BackendDbInterface {
       ] as const
     ).every(
       (x) =>
-        x in db && typeof (db as Partial<BackendDbInterface>)[x] === "function"
+        x in db && typeof (db as Partial<BackendDbInterface>)[x] === "function",
     )
   );
 }

src/db/types/ExportImport.ts

@@ -0,0 +1,68 @@
+import type { DbInterface } from "./DbInterface.js";
+
+/**
+ * The kinds of records that can travel through an export/import stream.
+ *
+ * `Session` is intentionally excluded: it has no CRUD/list surface in
+ * {@link DbInterface} and is ephemeral/non-portable between instances.
+ */
+export type ExportKind = "user" | "abode" | "resident" | "apikey" | "note";
+
+export type ExportFilter = {
+  /** Include only these kinds; omit = all kinds. */
+  kinds?: ExportKind[];
+  /** Excluded after `kinds` is applied. */
+  excludeKinds?: ExportKind[];
+  /** aid allowlist — scopes abode/resident/note. */
+  abodes?: string[];
+  /** uid allowlist — scopes user/apikey. */
+  users?: string[];
+};
+
+export interface ExportOptions {
+  filter?: ExportFilter;
+  signal?: AbortSignal;
+}
+
+export interface Exportable {
+  /** Produce a stream of NDJSON lines (one JSON envelope per line). */
+  export(options?: ExportOptions): NodeJS.ReadableStream;
+}
+
+export interface ImportOptions {
+  filter?: ExportFilter;
+  signal?: AbortSignal;
+}
+
+export interface ImportResult {
+  counts: Partial<Record<ExportKind, number>>;
+}
+
+export interface Importable {
+  import(
+    source: NodeJS.ReadableStream,
+    options?: ImportOptions,
+  ): Promise<ImportResult>;
+}
+
+/**
+ * The NDJSON envelope written/read for every line. The leading line is a
+ * `meta` record; a trailing `error` record may appear if the source failed
+ * after streaming had already begun.
+ */
+export type ExportEnvelope =
+  | { kind: "meta"; data: ExportMeta }
+  | { kind: ExportKind; data: unknown }
+  | { kind: "error"; data: { message: string; code?: string } };
+
+export type ExportMeta = {
+  v: number;
+  exportedAt: string;
+  source: string;
+  /** The *effective* filter actually applied (may be narrower than requested). */
+  filter: ExportFilter;
+};
+
+export function isExportable(db: DbInterface): db is DbInterface & Exportable {
+  return typeof (db as Partial<Exportable>).export === "function";
+}

src/db/types/User.ts

@@ -27,7 +27,7 @@ export type LoginUser = {
 };
 
 export function isValidUserPassword(
-  password: string
+  password: string,
 ): password is User["password"] {
   if (password.startsWith("#")) {
     return ["unset"].includes(password.slice(1));

src/meta/dev/restart.ts

@@ -2,7 +2,7 @@ if (import.meta.hot) {
   import.meta.hot.on("message", (msg) => {
     if (
       msg.includes(
-        "A pending update was not accepted, and reached the root module:"
+        "A pending update was not accepted, and reached the root module:",
       )
     ) {
       throw new Error("[hot] Restarting due to unaccepted pending update");

src/meta/pack/natives.ts

@@ -32,23 +32,23 @@ async function getPackageJsonDir(path: string): Promise<string | null> {
 
 export async function findNative(
   module: string,
-  native: string
+  native: string,
 ): Promise<string> {
   const path = await getPackageJsonDir(
-    createRequire(import.meta.url).resolve(module)
+    createRequire(import.meta.url).resolve(module),
   );
   if (!path) throw new Error(`Cannot find module directory for ${module}`);
   const file = await find(path, native);
   if (!file)
     throw new Error(
-      `Cannot find native ${native} of package ${module} in ${path}`
+      `Cannot find native ${native} of package ${module} in ${path}`,
     );
   return file;
 }
 
 export async function tryFindNative(
   module: string,
-  native: string
+  native: string,
 ): Promise<string | null> {
   try {
     return await findNative(module, native);

src/meta/pack/validators.ts

@@ -22,8 +22,8 @@ export async function webpack(): Promise<{ code: string }> {
   let code: string = standaloneCode(
     validator,
     Object.fromEntries(
-      Object.entries(schemas).map(([id, schema]) => [id, schema.$id])
-    )
+      Object.entries(schemas).map(([id, schema]) => [id, schema.$id]),
+    ),
   );
 
   // assign the .schema ourselves to the validation functions

src/react/contexts/PopupManager.tsx

@@ -12,7 +12,7 @@ export interface PopupManagerContextData {
   openPopup(popup: ComponentType<{ id: string; onClose: () => void }>): string;
   openPopup<T>(
     popup: ComponentType<{ id: string; onClose: () => void } & T>,
-    props: T
+    props: T,
   ): string;
 
   closePopup(id: string): void;
@@ -34,7 +34,7 @@ export function PopupManager({ children }: { children: ReactNode }) {
   const openPopup = useCallback<PopupManagerContextData["openPopup"]>(
     (
       Component: ComponentType<{ id: string; onClose: () => void }>,
-      props = {}
+      props = {},
     ) => {
       const id = crypto.randomUUID();
       Object.assign(props, {
@@ -45,14 +45,14 @@ export function PopupManager({ children }: { children: ReactNode }) {
       setPopups((prev) => [...prev, { id, Component, props }]);
       return id;
     },
-    []
+    [],
   );
   const closePopup = useCallback((id: string) => {
     setPopups((prev) => prev.filter((x) => x.id !== id));
   }, []);
   const ctx = useMemo<PopupManagerContextData>(
     () => ({ openPopup, closePopup }),
-    []
+    [],
   );
 
   return (

src/react/hooks/data/residents.ts

@@ -19,7 +19,7 @@ export function useDataResidentsByAbodeId(aid: string) {
   const status = useLoad(loadResidentsByAbodeId, { aid });
   const residents = useMemo(
     () => Object.values(allResidents).filter((x) => x.aid === aid),
-    [allResidents, aid]
+    [allResidents, aid],
   );
   return { ...status, residents };
 }
@@ -29,7 +29,7 @@ export function useDataResidentsByUserId(uid: string) {
   const status = useLoad(loadResidentsByUserId, { uid });
   const residents = useMemo(
     () => Object.values(allResidents).filter((x) => x.uid === uid),
-    [allResidents, uid]
+    [allResidents, uid],
   );
   return { ...status, residents };
 }

src/react/hooks/useAction.ts

@@ -5,7 +5,7 @@ import type { Store } from "../store/store.js";
 import { useStore } from "../store/react.js";
 
 export function useAction<P extends any[], R>(
-  action: (...params: [...P, { db: DbInterface; store: Store }]) => Promise<R>
+  action: (...params: [...P, { db: DbInterface; store: Store }]) => Promise<R>,
 ): (...args: P) => Promise<R> {
   const db = use(DbContext);
   const store = useStore();
@@ -15,6 +15,6 @@ export function useAction<P extends any[], R>(
       if (!db) throw new Error("DB not present");
       return action(...params, { db, store });
     },
-    [action, db]
+    [action, db],
   );
 }

src/react/hooks/useLoad.ts

@@ -32,7 +32,7 @@ export function useLoad<P>(loader: Loader<P>, params?: P): UseLoadResult {
 
   const refresh = useCallback(
     () => load({ loader, params: params!, store, db, refresh: true }),
-    [loader, params, db]
+    [loader, params, db],
   );
 
   return {

src/react/store/actions/abodes.ts

@@ -8,7 +8,7 @@ import type { Store } from "../store.js";
 
 export async function deleteAbodeById(
   aid: string,
-  { store, db }: { store: Store; db: DbInterface }
+  { store, db }: { store: Store; db: DbInterface },
 ): Promise<void> {
   await Promise.all([
     waitForLoadIfLoading(store, "loadAllAbodes"),
@@ -22,7 +22,7 @@ export async function deleteAbodeById(
 
 export async function updateAbode(
   abode: UpdateAbode,
-  { store, db }: { store: Store; db: DbInterface }
+  { store, db }: { store: Store; db: DbInterface },
 ): Promise<void> {
   await Promise.all([
     waitForLoadIfLoading(store, "loadAllAbodes"),
@@ -38,7 +38,7 @@ export async function updateAbode(
 
 export async function createAbode(
   abode: CreateAbode,
-  { store, db }: { store: Store; db: DbInterface }
+  { store, db }: { store: Store; db: DbInterface },
 ): Promise<string> {
   await waitForLoadIfLoading(store, "loadAllAbodes");
 

src/react/store/actions/users.ts

@@ -7,7 +7,7 @@ import type { Store } from "../store.js";
 
 export async function deleteUserById(
   uid: string,
-  { store, db }: { store: Store; db: DbInterface }
+  { store, db }: { store: Store; db: DbInterface },
 ): Promise<void> {
   await Promise.all([
     waitForLoadIfLoading(store, "loadAllUsers"),
@@ -24,7 +24,7 @@ export async function deleteUserById(
 
 export async function updateUser(
   user: UpdateUser,
-  { store, db }: { store: Store; db: DbInterface }
+  { store, db }: { store: Store; db: DbInterface },
 ): Promise<void> {
   await Promise.all([
     waitForLoadIfLoading(store, "loadAllUsers"),
@@ -41,7 +41,7 @@ export async function updateUser(
 
 export async function createUser(
   user: CreateUser,
-  { store, db }: { store: Store; db: DbInterface }
+  { store, db }: { store: Store; db: DbInterface },
 ): Promise<string> {
   await waitForLoadIfLoading(store, "loadAllUsers");
 

src/react/store/load.ts

@@ -48,7 +48,7 @@ async function loadImpl<P>({
     setLoading([
       id,
       { status: refresh ? "refreshing" : "loading", type, params },
-    ])
+    ]),
   );
   const controller = new AbortController();
   try {
@@ -69,7 +69,10 @@ async function loadImpl<P>({
     store.dispatch(setLoading([id, { status: "loaded", type, params }]));
   } catch (e) {
     store.dispatch(
-      setLoading([id, { status: "error", type, params, error: objectError(e) }])
+      setLoading([
+        id,
+        { status: "error", type, params, error: objectError(e) },
+      ]),
     );
     throw e;
   }
@@ -114,7 +117,7 @@ export function loader<P>(loader: Loader<P>): Loader<P> {
 export async function waitForLoadIfLoading(
   store: Store,
   id: string,
-  { signal }: { signal?: AbortSignal } = {}
+  { signal }: { signal?: AbortSignal } = {},
 ) {
   if (!getLoadingStatus(store.getState(), id)) return;
   return waitFor(
@@ -123,6 +126,6 @@ export async function waitForLoadIfLoading(
       const status = getLoadingStatus(state, id);
       return status === "loaded" || status === "error";
     },
-    { signal }
+    { signal },
   );
 }

src/react/store/react.tsx

@@ -16,7 +16,7 @@ export function Provider(
   props: Omit<ProviderProps, "context" | "store" | "serverState"> & {
     store: Store;
     serverState?: State;
-  }
+  },
 ) {
   return <RawProvider context={AbodeStoreContext} {...props} />;
 }

src/react/store/slices/loading.ts

@@ -40,7 +40,7 @@ const loadingSlice = createSlice({
   reducers: {
     setLoading: (
       state,
-      action: PayloadAction<[id: string, state: LoadingState]>
+      action: PayloadAction<[id: string, state: LoadingState]>,
     ) => {
       state[action.payload[0]] = action.payload[1];
     },

src/react/store/slices/users.ts

@@ -19,7 +19,7 @@ const usersSlice = createSlice({
     getUser: usersSelectors.selectById,
     getUserByEmail: (state, email: string) =>
       Object.values(state.entities).find(
-        (x): x is ClientUser => "email" in x && x.email === email
+        (x): x is ClientUser => "email" in x && x.email === email,
       ),
     getUsers: usersSelectors.selectEntities,
     getUserIds: usersSelectors.selectIds,

src/react/store/utils.ts

@@ -3,7 +3,7 @@ import type { State, Store } from "./store.js";
 export async function waitFor(
   store: Store,
   cond: (state: State) => boolean,
-  { signal }: { signal?: AbortSignal } = {}
+  { signal }: { signal?: AbortSignal } = {},
 ): Promise<void> {
   return new Promise<void>((ok, ko) => {
     signal?.throwIfAborted();
@@ -28,7 +28,7 @@ export async function waitFor(
       () => {
         controller.abort();
       },
-      { signal: controller.signal }
+      { signal: controller.signal },
     );
   });
 }

src/schema/rawSchemas.ts

@@ -1,23 +1,23 @@
-export { default as user } from "./user/user.schema.json" with {type: 'json'};
-export { default as createuser } from "./user/createuser.schema.json" with {type: 'json'};
-export { default as updateuser } from "./user/updateuser.schema.json" with {type: 'json'};
-export { default as partialuser } from "./user/partialuser.schema.json" with {type: 'json'};
-export { default as clientuser } from "./user/clientuser.schema.json" with {type: 'json'};
-export { default as userflags } from "./user/userflags.schema.json" with {type: 'json'};
-export { default as loginuser } from "./user/loginuser.schema.json" with {type: 'json'};
+export { default as user } from "./user/user.schema.json" with { type: "json" };
+export { default as createuser } from "./user/createuser.schema.json" with { type: "json" };
+export { default as updateuser } from "./user/updateuser.schema.json" with { type: "json" };
+export { default as partialuser } from "./user/partialuser.schema.json" with { type: "json" };
+export { default as clientuser } from "./user/clientuser.schema.json" with { type: "json" };
+export { default as userflags } from "./user/userflags.schema.json" with { type: "json" };
+export { default as loginuser } from "./user/loginuser.schema.json" with { type: "json" };
 
-export { default as abode } from './abode/abode.schema.json' with {type: 'json'};
-export { default as createabode } from './abode/createabode.schema.json' with {type: 'json'};
-export { default as updateabode } from './abode/updateabode.schema.json' with {type: 'json'};
+export { default as abode } from "./abode/abode.schema.json" with { type: "json" };
+export { default as createabode } from "./abode/createabode.schema.json" with { type: "json" };
+export { default as updateabode } from "./abode/updateabode.schema.json" with { type: "json" };
 
-export { default as resident } from './resident/resident.schema.json' with {type: 'json'};
-export { default as createresident } from './resident/createresident.schema.json' with {type: 'json'};
-export { default as updateresident } from './resident/updateresident.schema.json' with {type: 'json'};
-export { default as residentflags } from './resident/residentflags.schema.json' with {type: 'json'};
+export { default as resident } from "./resident/resident.schema.json" with { type: "json" };
+export { default as createresident } from "./resident/createresident.schema.json" with { type: "json" };
+export { default as updateresident } from "./resident/updateresident.schema.json" with { type: "json" };
+export { default as residentflags } from "./resident/residentflags.schema.json" with { type: "json" };
 
-export { default as createapikey } from './apikey/createapikey.schema.json' with {type: 'json'};
-export { default as apikeypermissions } from './apikey/apikeypermissions.schema.json' with {type: 'json'};
+export { default as createapikey } from "./apikey/createapikey.schema.json" with { type: "json" };
+export { default as apikeypermissions } from "./apikey/apikeypermissions.schema.json" with { type: "json" };
 
-export { default as createnote } from './note/createnote.schema.json' with {type: 'json'};
-export { default as updatenote } from './note/updatenote.schema.json' with {type: 'json'};
-export { default as partialnoteproperties } from './note/partialnoteproperties.schema.json' with {type: 'json'};
+export { default as createnote } from "./note/createnote.schema.json" with { type: "json" };
+export { default as updatenote } from "./note/updatenote.schema.json" with { type: "json" };
+export { default as partialnoteproperties } from "./note/partialnoteproperties.schema.json" with { type: "json" };

src/schema/schemas.ts

@@ -39,7 +39,7 @@ function checkSchema(name: string, schema: AnySchema) {
   if (!schema.$id) throw new Error(`Missing $id for schema ${name}`);
   if (
     !schema.$id.match(
-      /^https:\/\/abode\.codi\.moe\/schema\/[a-zA-Z0_9_-]+\.schema\.json$/
+      /^https:\/\/abode\.codi\.moe\/schema\/[a-zA-Z0_9_-]+\.schema\.json$/,
     )
   )
     throw new Error(`Unexpected $id for schema ${name}`);

src/schema/validators.ts

@@ -18,7 +18,7 @@ const validators = Object.fromEntries(
   Object.entries(schemas).map(([name, schema]) => [
     name,
     validator.compile(schema),
-  ])
+  ]),
 ) as unknown as {
   [T in keyof Types]: {
     (obj: unknown): obj is Types[T];

src/tui/App.tsx

@@ -69,7 +69,7 @@ function App() {
     (input, key) => {
       if (input === "q" || key.escape) app.exit();
     },
-    { isActive }
+    { isActive },
   );
 
   const [activeCollection, setActiveCollection] =

src/tui/components/panels/AbodesPanel.tsx

@@ -41,11 +41,11 @@ export function AbodesPanel() {
 
   const onSelect = useCallback(
     (abode: Abode) => openPopup(AbodePopup, { aid: abode.aid }),
-    [openPopup]
+    [openPopup],
   );
   const buttons = useMemo<ButtonListItem[]>(
     () => [{ children: "New", onClick: () => openPopup(CreateAbodePopup) }],
-    [openPopup]
+    [openPopup],
   );
 
   return (

src/tui/components/panels/UsersPanel.tsx

@@ -59,11 +59,11 @@ export function UsersPanel() {
 
   const onSelect = useCallback(
     (user: ClientUser | PartialUser) => openPopup(UserPopup, { uid: user.uid }),
-    [openPopup]
+    [openPopup],
   );
   const buttons = useMemo<ButtonListItem[]>(
     () => [{ children: "New", onClick: () => openPopup(CreateUserPopup) }],
-    [openPopup]
+    [openPopup],
   );
 
   return (

src/tui/components/ui/Button.tsx

@@ -18,7 +18,7 @@ export function Button({
     (input, key) => {
       if (input === " " || key.return) onClick();
     },
-    { isActive: isFocused }
+    { isActive: isFocused },
   );
 
   return <Text inverse={isFocused}>[{children}]</Text>;
@@ -66,7 +66,7 @@ export function ButtonList({
         setSelected((prev) => (prev - 1 + buttons.length) % buttons.length);
       }
     },
-    { isActive: isFocused || forceFocus || false }
+    { isActive: isFocused || forceFocus || false },
   );
 
   return (

src/tui/components/ui/ListBox.tsx

@@ -49,7 +49,7 @@ export function ListBox<T extends string>({
         setSelected(items[(items.indexOf(selected) + 1) % items.length]);
       } else if (key.upArrow) {
         setSelected(
-          items[(items.indexOf(selected) - 1 + items.length) % items.length]
+          items[(items.indexOf(selected) - 1 + items.length) % items.length],
         );
       } else if (key.pageUp) {
         setSelected(items[0]);
@@ -57,7 +57,7 @@ export function ListBox<T extends string>({
         setSelected(items[items.length - 1]);
       }
     },
-    { isActive: isFocused }
+    { isActive: isFocused },
   );
 
   return (

src/tui/components/ui/ListDisplay.tsx

@@ -36,14 +36,14 @@ export function ListDisplay<T>({
         onSelect?.(items[selected]);
       }
     },
-    { isActive: isFocused }
+    { isActive: isFocused },
   );
 
   useEffect(() => {
     if (selected < start) setStart(selected);
     else if (selected >= slice)
       setStart(
-        Math.max(Math.min(selected - slice + start + 1, items.length - 1), 0)
+        Math.max(Math.min(selected - slice + start + 1, items.length - 1), 0),
       );
   }, [selected, start, slice, items.length]);
   useEffect(() => {
@@ -56,7 +56,7 @@ export function ListDisplay<T>({
 
   const indexed = useMemo(
     () => items.map((item, index) => ({ item, index })),
-    [items]
+    [items],
   );
 
   return (

src/tui/components/ui/Popup.tsx

@@ -16,7 +16,7 @@ export function Popup({
     (_, key) => {
       if (key.escape) onClose?.();
     },
-    { isActive: active && !!onClose }
+    { isActive: active && !!onClose },
   );
 
   return (

src/tui/components/ui/SearchPanel.tsx

@@ -52,7 +52,7 @@ export function SearchPanel<T>({
         refresh?.();
       }
     },
-    { isActive: isFocused && !!refresh }
+    { isActive: isFocused && !!refresh },
   );
 
   const topbar = !!match || !!buttons?.length;

src/util/hash.ts

@@ -2,13 +2,13 @@ import { argon2id, argon2Verify } from "hash-wasm";
 
 export async function validatePassword(
   password: string,
-  hash: string
+  hash: string,
 ): Promise<boolean> {
   return await argon2Verify({ password, hash });
 }
 
 export async function hashPassword(
-  password: string
+  password: string,
 ): Promise<`$${string}$${string}`> {
   const salt = new Uint8Array(16);
   crypto.getRandomValues(salt);

src/util/xmlwriter.ts

@@ -7,11 +7,11 @@ const escapes = {
 };
 
 function parseAdd<T>(
-  rest: (Record<string, string> | string | ((writer: XmlWriter) => T))[]
+  rest: (Record<string, string> | string | ((writer: XmlWriter) => T))[],
 ): [
   props?: Record<string, string>,
   content?: string,
-  children?: (writer: XmlWriter) => T
+  children?: (writer: XmlWriter) => T,
 ] {
   let props: Record<string, string> | undefined;
   let children: ((writer: XmlWriter) => T) | undefined;
@@ -55,7 +55,7 @@ export class XmlWriter {
     tag: string,
     props?: Record<string, string>,
     content?: string,
-    children?: NonNullable<unknown>
+    children?: NonNullable<unknown>,
   ) {
     const top = this.#stack.at(-1);
     if (top && !top.children) {
@@ -104,7 +104,7 @@ export class XmlWriter {
   add(
     tag: string,
     props: Record<string, string>,
-    children: (writer: XmlWriter) => void
+    children: (writer: XmlWriter) => void,
   ): XmlWriter;
   add(
     tag: string,
@@ -125,23 +125,21 @@ export class XmlWriter {
   addAsync(
     tag: string,
     props: Record<string, string>,
-    content: string
+    content: string,
   ): Promise<void>;
   addAsync(
     tag: string,
-    children: (writer: XmlWriter) => Promise<void>
+    children: (writer: XmlWriter) => Promise<void>,
   ): Promise<void>;
   addAsync(
     tag: string,
     props: Record<string, string>,
-    children: (writer: XmlWriter) => Promise<void>
+    children: (writer: XmlWriter) => Promise<void>,
   ): Promise<void>;
   async addAsync(
     tag: string,
     ...rest: (
-      | Record<string, string>
-      | string
-      | ((writer: XmlWriter) => Promise<void>)
+      Record<string, string> | string | ((writer: XmlWriter) => Promise<void>)
     )[]
   ): Promise<void> {
     const [props, content, children] = parseAdd(rest);
@@ -164,7 +162,7 @@ export class XmlWriter {
       | Parameters<InstanceType<typeof XmlWriter>["add"]>
       | [
           NonNullable<ConstructorParameters<typeof XmlWriter>[0]>,
-          ...Parameters<InstanceType<typeof XmlWriter>["add"]>
+          ...Parameters<InstanceType<typeof XmlWriter>["add"]>,
         ]
   ): string {
     let options: ConstructorParameters<typeof XmlWriter>[0];
@@ -172,7 +170,7 @@ export class XmlWriter {
       options = rest.shift()! as ConstructorParameters<typeof XmlWriter>[0];
     }
     return new XmlWriter(options).add(
-      ...(rest as Parameters<InstanceType<typeof XmlWriter>["add"]>)
+      ...(rest as Parameters<InstanceType<typeof XmlWriter>["add"]>),
     ).content;
   }
 
@@ -188,7 +186,7 @@ export class XmlWriter {
       | Parameters<InstanceType<typeof XmlWriter>["addAsync"]>
       | [
           NonNullable<ConstructorParameters<typeof XmlWriter>[0]>,
-          ...Parameters<InstanceType<typeof XmlWriter>["addAsync"]>
+          ...Parameters<InstanceType<typeof XmlWriter>["addAsync"]>,
         ]
   ): Promise<string> {
     let options: ConstructorParameters<typeof XmlWriter>[0];
@@ -197,7 +195,7 @@ export class XmlWriter {
     }
     const writer = new XmlWriter(options);
     await writer.addAsync(
-      ...(rest as Parameters<InstanceType<typeof XmlWriter>["addAsync"]>)
+      ...(rest as Parameters<InstanceType<typeof XmlWriter>["addAsync"]>),
     );
     return writer.content;
   }

src/webapi/apirouter.ts

@@ -16,6 +16,29 @@ import {
 } from "../schema/validators.js";
 import { authenticate } from "./middleware/authenticate.js";
 import { InvalidAbodeError, NotFoundAbodeError } from "../db/types/errors.js";
+import { isExportable } from "../db/types/ExportImport.js";
+import type { ExportFilter, ExportKind } from "../db/types/ExportImport.js";
+import { intersectExportFilters, isExportKind } from "../db/export/filter.js";
+import { computeForcedExportFilter } from "./exportScope.js";
+
+function parseExportFilter(query: Record<string, unknown>): ExportFilter {
+  const list = (v: unknown): string[] | undefined => {
+    if (typeof v !== "string" || !v) return undefined;
+    return v.split(",").filter(Boolean);
+  };
+  const kinds = (v: unknown): ExportKind[] | undefined =>
+    list(v)?.filter(isExportKind);
+  const filter: ExportFilter = {};
+  const k = kinds(query.kinds);
+  if (k) filter.kinds = k;
+  const ek = kinds(query.excludeKinds);
+  if (ek) filter.excludeKinds = ek;
+  const abodes = list(query.abodes);
+  if (abodes) filter.abodes = abodes;
+  const users = list(query.users);
+  if (users) filter.users = users;
+  return filter;
+}
 
 export function apirouter(db: BackendDbInterface): KoaRouter {
   const router = new KoaRouter();
@@ -42,6 +65,31 @@ export function apirouter(db: BackendDbInterface): KoaRouter {
     ctx.status = 204;
   });
 
+  router.get("/export", authenticate(db), async (ctx) => {
+    // Everything that can throw a domain error runs *before* any byte is
+    // written, so `convertError` still applies. Once `ctx.body` is a stream,
+    // a mid-stream failure surfaces as a trailing `error` NDJSON line instead.
+    const forced = await computeForcedExportFilter(db, {
+      user: ctx.user!,
+      session: ctx.session!,
+    });
+    const effective = intersectExportFilters(
+      parseExportFilter(ctx.query),
+      forced,
+    );
+    if (!isExportable(db)) {
+      ctx.status = 501;
+      ctx.body = { ok: false, error: "export_unsupported" };
+      return;
+    }
+    const ac = new AbortController();
+    ctx.res.on("close", () => {
+      if (!ctx.res.writableEnded) ac.abort();
+    });
+    ctx.type = "application/x-ndjson";
+    ctx.body = db.export({ filter: effective, signal: ac.signal });
+  });
+
   router.use("/users", authenticate(db));
   router.get("/users", async (ctx) => {
     ctx.body = await db.listUsers();
@@ -61,7 +109,7 @@ export function apirouter(db: BackendDbInterface): KoaRouter {
     jsonBody({ validate: updateuser, includeParams: ["uid"] }),
     async (ctx) => {
       ctx.body = await db.updateUser(ctx.request.body);
-    }
+    },
   );
   router.delete("/users/:uid", async (ctx) => {
     await db.deleteUserById(ctx.params.uid);
@@ -82,7 +130,7 @@ export function apirouter(db: BackendDbInterface): KoaRouter {
     async (ctx) => {
       const [apikey, token] = await db.createApikey(ctx.request.body);
       ctx.body = { apikey, token };
-    }
+    },
   );
   router.get("/users/:uid/apikeys/:kid", async (ctx) => {
     const apikey = await db.getApikeyById(ctx.params.kid);
@@ -118,7 +166,7 @@ export function apirouter(db: BackendDbInterface): KoaRouter {
     jsonBody({ validate: updateabode, includeParams: ["aid"] }),
     async (ctx) => {
       ctx.body = await db.updateAbode(ctx.request.body, { uid: ctx.user!.uid });
-    }
+    },
   );
   router.delete("/abodes/:aid", async (ctx) => {
     await db.deleteAbodeById(ctx.params.aid);
@@ -138,7 +186,7 @@ export function apirouter(db: BackendDbInterface): KoaRouter {
     jsonBody({ validate: createnote, includeParams: ["aid"] }),
     async (ctx) => {
       ctx.body = await db.createNote(ctx.request.body, { uid: ctx.user!.uid });
-    }
+    },
   );
 
   router.use("/residents", authenticate(db));
@@ -152,7 +200,7 @@ export function apirouter(db: BackendDbInterface): KoaRouter {
       ctx.body = await db.createResident(ctx.request.body, {
         uid: ctx.user!.uid,
       });
-    }
+    },
   );
   router.get("/residents/:uid/:aid", async (ctx) => {
     ctx.body = await db.getResidentById(ctx.params.uid, ctx.params.aid);
@@ -164,7 +212,7 @@ export function apirouter(db: BackendDbInterface): KoaRouter {
       ctx.body = await db.updateResident(ctx.request.body, {
         uid: ctx.user!.uid,
       });
-    }
+    },
   );
   router.delete("/residents/:uid/:aid", async (ctx) => {
     await db.deleteResidentById(ctx.params.uid, ctx.params.aid);
@@ -192,7 +240,7 @@ export function apirouter(db: BackendDbInterface): KoaRouter {
     jsonBody({ validate: updatenote, includeParams: ["nid"] }),
     async (ctx) => {
       ctx.body = await db.updateNote(ctx.request.body, { uid: ctx.user!.uid });
-    }
+    },
   );
   router.delete("/notes/:nid", async (ctx) => {
     await db.deleteNoteById(ctx.params.nid);

src/webapi/exportScope.ts

@@ -0,0 +1,58 @@
+import type { Context } from "koa";
+import type { BackendDbInterface } from "../db/types/DbInterface.js";
+import type { ClientUser } from "../db/types/User.js";
+import type { ExportFilter } from "../db/types/ExportImport.js";
+
+/**
+ * Compute the export scope that must be *forced* on a caller, independent of
+ * anything they requested. Returns `null` when the caller is unrestricted (a
+ * global admin whose credential imposes no narrowing) — their own filter, if
+ * any, is then honored verbatim as a voluntary narrowing.
+ *
+ * Otherwise returns `{ abodes, users }`: the abodes the caller resides in, and
+ * the users needed to keep that data referentially whole (the caller plus every
+ * co-resident of those abodes). This is the maximum a non-admin may export; the
+ * route intersects it with any caller-supplied filter (never a union).
+ */
+export async function computeForcedExportFilter(
+  db: BackendDbInterface,
+  ctx: { user: ClientUser; session: NonNullable<Context["session"]> },
+): Promise<ExportFilter | null> {
+  const { user, session } = ctx;
+
+  if (user.flags.admin) {
+    if (session.source !== "apikey") return null;
+    const p = session.key.permissions;
+    const unrestricted =
+      !!p.admin &&
+      !!p.all &&
+      !p.restrict_users?.length &&
+      !p.restrict_abodes?.length;
+    if (unrestricted) return null;
+  }
+
+  const residencies = await db.listResidentsByUserId(user.uid);
+  const abodeSet = new Set(residencies.map((r) => r.aid));
+  const userSet = new Set<string>([user.uid]);
+  for (const aid of abodeSet) {
+    for (const u of await db.listUsersByAbodeId(aid)) userSet.add(u.uid);
+  }
+
+  let abodes = [...abodeSet];
+  let users = [...userSet];
+
+  // An apikey can only narrow what its owning user could otherwise export.
+  if (session.source === "apikey") {
+    const p = session.key.permissions;
+    if (p.restrict_abodes?.length) {
+      const allow = new Set(p.restrict_abodes);
+      abodes = abodes.filter((a) => allow.has(a));
+    }
+    if (p.restrict_users?.length) {
+      const allow = new Set(p.restrict_users);
+      users = users.filter((u) => allow.has(u));
+    }
+  }
+
+  return { abodes, users };
+}

src/webapi/schemarouter.ts

@@ -16,7 +16,7 @@ export function schemarouter(): KoaRouter {
             url: `${ctx.URL}/${name}.schema.json`,
           },
         ];
-      })
+      }),
     );
   });
 

test/backends/api/api-interface.test.ts

@@ -3,7 +3,11 @@ import assert from "node:assert/strict";
 import { createServer } from "node:http";
 import type { AddressInfo } from "node:net";
 import { ApiInterface } from "../../../src/db/api/ApiInterface.js";
-import { apiProtocols, isApiUrl, parseApiUrl } from "../../../src/db/api/url.js";
+import {
+  apiProtocols,
+  isApiUrl,
+  parseApiUrl,
+} from "../../../src/db/api/url.js";
 import {
   NotFoundAbodeError,
   NotAuthorizedAbodeError,
@@ -86,7 +90,7 @@ describe("parseApiUrl", () => {
 
   it("extra query params become headers", () => {
     const [, { headers }] = parseApiUrl(
-      "http://example.com?X-Custom-Header=value"
+      "http://example.com?X-Custom-Header=value",
     );
     assert.equal(headers["X-Custom-Header"], "value");
   });
@@ -94,7 +98,7 @@ describe("parseApiUrl", () => {
   it("throws for non-api protocol", () => {
     assert.throws(
       () => parseApiUrl("sqlite:///db.sqlite"),
-      /Not an \{abode\+,\}http\{s,\}: protocol/
+      /Not an \{abode\+,\}http\{s,\}: protocol/,
     );
   });
 });
@@ -106,18 +110,22 @@ describe("ApiInterface HTTP error mapping", () => {
 
   before(async () => {
     let nextStatus = 500;
-    respondWith = (s) => { nextStatus = s; };
+    respondWith = (s) => {
+      nextStatus = s;
+    };
 
     const server = createServer((req, res) => {
       res.writeHead(nextStatus, { "Content-Type": "application/json" });
       res.end(JSON.stringify({ ok: false, error: "test" }));
     });
-    await new Promise<void>((resolve) => server.listen(0, "127.0.0.1", resolve));
+    await new Promise<void>((resolve) =>
+      server.listen(0, "127.0.0.1", resolve),
+    );
     const { port } = server.address() as AddressInfo;
     serverUrl = `http://127.0.0.1:${port}`;
     closeServer = () =>
       new Promise<void>((resolve, reject) =>
-        server.close((err) => (err ? reject(err) : resolve()))
+        server.close((err) => (err ? reject(err) : resolve())),
       );
   });
 
@@ -131,7 +139,7 @@ describe("ApiInterface HTTP error mapping", () => {
       (err) => {
         assert.ok(err instanceof NotFoundAbodeError);
         return true;
-      }
+      },
     );
   });
 
@@ -143,7 +151,7 @@ describe("ApiInterface HTTP error mapping", () => {
       (err) => {
         assert.ok(err instanceof NotAuthorizedAbodeError);
         return true;
-      }
+      },
     );
   });
 
@@ -155,7 +163,7 @@ describe("ApiInterface HTTP error mapping", () => {
       (err) => {
         assert.ok(err instanceof ReadonlyAbodeError);
         return true;
-      }
+      },
     );
   });
 
@@ -167,7 +175,7 @@ describe("ApiInterface HTTP error mapping", () => {
       (err) => {
         assert.ok(err instanceof InvalidAbodeError);
         return true;
-      }
+      },
     );
   });
 
@@ -179,7 +187,7 @@ describe("ApiInterface HTTP error mapping", () => {
       (err) => {
         assert.ok(err instanceof ConflictAbodeError);
         return true;
-      }
+      },
     );
   });
 });

test/backends/api/auth-http.test.ts

@@ -92,7 +92,11 @@ describe("api backend: auth over HTTP", async () => {
     const self = await fetch(`${server.url}/auth/self`, {
       headers: { Cookie: `abode_session=${cookie}` },
     });
-    assert.equal(self.status, 401, "session was invalidated server-side, not just the cookie cleared");
+    assert.equal(
+      self.status,
+      401,
+      "session was invalidated server-side, not just the cookie cleared",
+    );
   });
 
   it("POST /auth/clear-sessions invalidates outstanding session cookies", async () => {

test/backends/sqlite/index.test.ts

@@ -10,10 +10,10 @@ import { runAuthTests } from "../../shared/auth.js";
 
 async function createExpiredApikey(
   db: BackendDbInterface,
-  uid: string
+  uid: string,
 ): Promise<`at_${string}`> {
   const si = db as SqliteInterface;
-  const token = (`at_${"e".repeat(32)}`) as `at_${string}`;
+  const token = `at_${"e".repeat(32)}` as `at_${string}`;
   const kid = crypto.randomUUID();
   const { sql } = si._;
   si._.db.run(sql`

test/backends/sqlite/migrator.test.ts

@@ -46,7 +46,7 @@ describe("SqliteMigrator", () => {
     assert.equal(applied.length, 3);
     assert.deepEqual(
       applied.map((m) => m.id),
-      [1, 2, 3]
+      [1, 2, 3],
     );
     db.destroy();
   });
@@ -66,7 +66,7 @@ describe("SqliteMigrator", () => {
     const migrator = new SqliteMigrator(db);
     await assert.rejects(
       () => migrator.migrateTo(9999),
-      /No known migration with id 9999/
+      /No known migration with id 9999/,
     );
     db.destroy();
   });

test/backends/sqlite/sql.test.ts

@@ -1,6 +1,12 @@
 import { describe, it } from "node:test";
 import assert from "node:assert/strict";
-import { sql, catSql, joinSql, calcUpdates, unsafeSql } from "../../../src/db/sqlite/sql.js";
+import {
+  sql,
+  catSql,
+  joinSql,
+  calcUpdates,
+  unsafeSql,
+} from "../../../src/db/sqlite/sql.js";
 
 describe("sql template tag", () => {
   it("produces correct sql and empty vars for plain text", () => {

test/backends/sqlite/wrapped-db.test.ts

@@ -10,13 +10,19 @@ function runWrappedDbSuite(name: string, makeDb: () => WrappedDb) {
 
     before(() => {
       db = makeDb();
-      db.run(unsafeSql("CREATE TABLE IF NOT EXISTS test (id INTEGER PRIMARY KEY, val TEXT NOT NULL)"));
+      db.run(
+        unsafeSql(
+          "CREATE TABLE IF NOT EXISTS test (id INTEGER PRIMARY KEY, val TEXT NOT NULL)",
+        ),
+      );
     });
 
     after(() => db.destroy());
 
     it("run INSERT returns changes count", () => {
-      const { changes } = db.run(sql`INSERT INTO test(val) VALUES(${{ text: "hello" }})`);
+      const { changes } = db.run(
+        sql`INSERT INTO test(val) VALUES(${{ text: "hello" }})`,
+      );
       assert.equal(changes, 1);
     });
 
@@ -24,7 +30,9 @@ function runWrappedDbSuite(name: string, makeDb: () => WrappedDb) {
       db.run(unsafeSql("DELETE FROM test"));
       db.run(sql`INSERT INTO test(val) VALUES(${{ text: "a" }})`);
       db.run(sql`INSERT INTO test(val) VALUES(${{ text: "b" }})`);
-      const rows = db.all<{ val: string }>(unsafeSql("SELECT val FROM test ORDER BY val"));
+      const rows = db.all<{ val: string }>(
+        unsafeSql("SELECT val FROM test ORDER BY val"),
+      );
       assert.equal(rows.length, 2);
       assert.equal(rows[0].val, "a");
       assert.equal(rows[1].val, "b");
@@ -38,7 +46,7 @@ function runWrappedDbSuite(name: string, makeDb: () => WrappedDb) {
       assert.equal(row.val, "one");
 
       const none = db.get<{ val: string }>(
-        sql`SELECT val FROM test WHERE val = ${{ text: "none" }}`
+        sql`SELECT val FROM test WHERE val = ${{ text: "none" }}`,
       );
       assert.equal(none, null);
     });
@@ -49,7 +57,7 @@ function runWrappedDbSuite(name: string, makeDb: () => WrappedDb) {
       db.run(sql`INSERT INTO test(val) VALUES(${{ text: "dup2" }})`);
       assert.throws(
         () => db.get<{ val: string }>(unsafeSql("SELECT val FROM test")),
-        /Multiple results/
+        /Multiple results/,
       );
     });
 
@@ -69,7 +77,7 @@ function runWrappedDbSuite(name: string, makeDb: () => WrappedDb) {
         db.multi(() => {
           db.run(sql`INSERT INTO test(val) VALUES(${{ text: "rollback" }})`);
           throw new Error("abort!");
-        })
+        }),
       );
       const rows = db.all<{ val: string }>(unsafeSql("SELECT val FROM test"));
       assert.equal(rows.length, 0);
@@ -82,7 +90,13 @@ function runWrappedDbSuite(name: string, makeDb: () => WrappedDb) {
 
     it("rethrow propagates non-SQLite errors unchanged", () => {
       const err = new Error("custom error");
-      assert.throws(() => db.rethrow(() => { throw err; }), (e) => e === err);
+      assert.throws(
+        () =>
+          db.rethrow(() => {
+            throw err;
+          }),
+        (e) => e === err,
+      );
     });
   });
 }
@@ -93,9 +107,7 @@ describe("better-sqlite3 WrappedDb", async () => {
   let bs3Ctor: (new (path: string) => WrappedDb) | null = null;
 
   try {
-    const mod = await import(
-      "../../../src/db/sqlite/impl/better-sqlite3.js"
-    );
+    const mod = await import("../../../src/db/sqlite/impl/better-sqlite3.js");
     bs3Ctor = mod.WrappedBetterSqlite3Db;
   } catch {
     // better-sqlite3 not available, skip

test/helpers/koa.ts

@@ -10,7 +10,7 @@ export interface TestServer {
 }
 
 export async function createTestServer(
-  db: BackendDbInterface
+  db: BackendDbInterface,
 ): Promise<TestServer> {
   const app = new Koa();
   const router = apirouter(db);
@@ -23,7 +23,7 @@ export async function createTestServer(
     url: `http://127.0.0.1:${port}`,
     close: () =>
       new Promise<void>((resolve, reject) =>
-        server.close((err) => (err ? reject(err) : resolve()))
+        server.close((err) => (err ? reject(err) : resolve())),
       ),
   };
 }

test/shared/abodes.ts

@@ -1,12 +1,15 @@
 import { describe, it, before, after } from "node:test";
 import assert from "node:assert/strict";
 import type { DbInterface } from "../../src/db/types/DbInterface.js";
-import { NotFoundAbodeError, InvalidAbodeError } from "../../src/db/types/errors.js";
+import {
+  NotFoundAbodeError,
+  InvalidAbodeError,
+} from "../../src/db/types/errors.js";
 import { hashPassword } from "../../src/util/hash.js";
 
 export function runAbodeTests(
   name: string,
-  getDb: () => Promise<{ db: DbInterface; close(): void }>
+  getDb: () => Promise<{ db: DbInterface; close(): void }>,
 ): void {
   describe(`${name}: abodes`, async () => {
     let db: DbInterface;
@@ -28,7 +31,10 @@ export function runAbodeTests(
     after(() => close());
 
     it("createAbode returns an Abode with expected fields", async () => {
-      const abode = await db.createAbode({ name: "Test Abode" }, { uid: ctxUid });
+      const abode = await db.createAbode(
+        { name: "Test Abode" },
+        { uid: ctxUid },
+      );
       assert.ok(abode.aid, "has aid");
       assert.equal(abode.name, "Test Abode");
       assert.ok(abode.created_at);
@@ -36,7 +42,10 @@ export function runAbodeTests(
     });
 
     it("getAbodeById returns the created abode", async () => {
-      const created = await db.createAbode({ name: "ById Abode" }, { uid: ctxUid });
+      const created = await db.createAbode(
+        { name: "ById Abode" },
+        { uid: ctxUid },
+      );
       const found = await db.getAbodeById(created.aid);
       assert.equal(found.aid, created.aid);
       assert.equal(found.name, "ById Abode");
@@ -48,14 +57,14 @@ export function runAbodeTests(
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
 
     it("listAbodes includes the created abode", async () => {
       const created = await db.createAbode(
         { name: `Listed Abode ${Date.now()}` },
-        { uid: ctxUid }
+        { uid: ctxUid },
       );
       const abodes = await db.listAbodes();
       assert.ok(Array.isArray(abodes));
@@ -67,32 +76,38 @@ export function runAbodeTests(
       const created = await db.createAbode({ name: "Before" }, { uid: ctxUid });
       const updated = await db.updateAbode(
         { aid: created.aid, name: "After" },
-        { uid: ctxUid }
+        { uid: ctxUid },
       );
       assert.equal(updated.aid, created.aid);
       assert.equal(updated.name, "After");
     });
 
     it("updateAbode with no fields throws InvalidAbodeError", async () => {
-      const created = await db.createAbode({ name: "No Update" }, { uid: ctxUid });
+      const created = await db.createAbode(
+        { name: "No Update" },
+        { uid: ctxUid },
+      );
       await assert.rejects(
         () => db.updateAbode({ aid: created.aid }, { uid: ctxUid }),
         (err) => {
           assert.ok(err instanceof InvalidAbodeError);
           return true;
-        }
+        },
       );
     });
 
     it("deleteAbodeById removes the abode", async () => {
-      const created = await db.createAbode({ name: "To Delete" }, { uid: ctxUid });
+      const created = await db.createAbode(
+        { name: "To Delete" },
+        { uid: ctxUid },
+      );
       await db.deleteAbodeById(created.aid);
       await assert.rejects(
         () => db.getAbodeById(created.aid),
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
 
@@ -102,7 +117,7 @@ export function runAbodeTests(
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
   });

test/shared/apikeys.ts

@@ -6,7 +6,7 @@ import { hashPassword } from "../../src/util/hash.js";
 
 export function runApikeyTests(
   name: string,
-  getDb: () => Promise<{ db: DbInterface; close(): void }>
+  getDb: () => Promise<{ db: DbInterface; close(): void }>,
 ): void {
   describe(`${name}: apikeys`, async () => {
     let db: DbInterface;
@@ -69,7 +69,7 @@ export function runApikeyTests(
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
 
@@ -85,7 +85,7 @@ export function runApikeyTests(
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
 
@@ -95,7 +95,7 @@ export function runApikeyTests(
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
   });

test/shared/auth.ts

@@ -11,7 +11,10 @@ import { hashPassword } from "../../src/util/hash.js";
 export function runAuthTests(
   name: string,
   getDb: () => Promise<{ db: BackendDbInterface; close(): void }>,
-  createExpiredApikey?: (db: BackendDbInterface, uid: string) => Promise<`at_${string}`>
+  createExpiredApikey?: (
+    db: BackendDbInterface,
+    uid: string,
+  ) => Promise<`at_${string}`>,
 ): void {
   describe(`${name}: auth`, async () => {
     let db: BackendDbInterface;
@@ -23,7 +26,12 @@ export function runAuthTests(
       ({ db, close } = await getDb());
       email = `auth-user-${Date.now()}@test.example`;
       const pw = await hashPassword(password);
-      await db.createUser({ email, name: "Auth User", password: pw, flags: {} });
+      await db.createUser({
+        email,
+        name: "Auth User",
+        password: pw,
+        flags: {},
+      });
     });
 
     after(() => close());
@@ -40,7 +48,7 @@ export function runAuthTests(
         (err) => {
           assert.ok(err instanceof NotAuthorizedAbodeError);
           return true;
-        }
+        },
       );
     });
 
@@ -54,7 +62,7 @@ export function runAuthTests(
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
 
@@ -71,7 +79,7 @@ export function runAuthTests(
         (err) => {
           assert.ok(err instanceof ConflictAbodeError);
           return true;
-        }
+        },
       );
     });
   });
@@ -118,7 +126,7 @@ export function runAuthTests(
         (err) => {
           assert.ok(err instanceof NotAuthorizedAbodeError);
           return true;
-        }
+        },
       );
     });
 
@@ -129,7 +137,7 @@ export function runAuthTests(
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
   });

test/shared/residents.ts

@@ -1,12 +1,15 @@
 import { describe, it, before, after } from "node:test";
 import assert from "node:assert/strict";
 import type { DbInterface } from "../../src/db/types/DbInterface.js";
-import { NotFoundAbodeError, InvalidAbodeError } from "../../src/db/types/errors.js";
+import {
+  NotFoundAbodeError,
+  InvalidAbodeError,
+} from "../../src/db/types/errors.js";
 import { hashPassword } from "../../src/util/hash.js";
 
 export function runResidentTests(
   name: string,
-  getDb: () => Promise<{ db: DbInterface; close(): void }>
+  getDb: () => Promise<{ db: DbInterface; close(): void }>,
 ): void {
   describe(`${name}: residents`, async () => {
     let db: DbInterface;
@@ -36,7 +39,7 @@ export function runResidentTests(
       uid = resUser.uid;
       const abode = await db.createAbode(
         { name: `Resident Abode ${Date.now()}` },
-        { uid: ctxUid }
+        { uid: ctxUid },
       );
       aid = abode.aid;
       await db.createResident({ uid, aid, flags: {} }, { uid: ctxUid });
@@ -56,12 +59,12 @@ export function runResidentTests(
         () =>
           db.getResidentById(
             "00000000-0000-0000-0000-000000000000",
-            "00000000-0000-0000-0000-000000000001"
+            "00000000-0000-0000-0000-000000000001",
           ),
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
 
@@ -101,7 +104,7 @@ export function runResidentTests(
     it("updateResident updates flags", async () => {
       const updated = await db.updateResident(
         { uid, aid, flags: { admin: true } },
-        { uid: ctxUid }
+        { uid: ctxUid },
       );
       assert.equal(updated.uid, uid);
       assert.deepEqual(updated.flags, { admin: true });
@@ -113,7 +116,7 @@ export function runResidentTests(
         (err) => {
           assert.ok(err instanceof InvalidAbodeError);
           return true;
-        }
+        },
       );
     });
 
@@ -125,15 +128,21 @@ export function runResidentTests(
         password: pw,
         flags: {},
       });
-      const abode2 = await db.createAbode({ name: "Del Abode" }, { uid: ctxUid });
-      await db.createResident({ uid: user2.uid, aid: abode2.aid, flags: {} }, { uid: ctxUid });
+      const abode2 = await db.createAbode(
+        { name: "Del Abode" },
+        { uid: ctxUid },
+      );
+      await db.createResident(
+        { uid: user2.uid, aid: abode2.aid, flags: {} },
+        { uid: ctxUid },
+      );
       await db.deleteResidentById(user2.uid, abode2.aid);
       await assert.rejects(
         () => db.getResidentById(user2.uid, abode2.aid),
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
 
@@ -142,12 +151,12 @@ export function runResidentTests(
         () =>
           db.deleteResidentById(
             "00000000-0000-0000-0000-000000000002",
-            "00000000-0000-0000-0000-000000000003"
+            "00000000-0000-0000-0000-000000000003",
           ),
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
   });

test/shared/sessions.ts

@@ -6,7 +6,7 @@ import { hashPassword } from "../../src/util/hash.js";
 
 export function runSessionTests(
   name: string,
-  getDb: () => Promise<{ db: BackendDbInterface; close(): void }>
+  getDb: () => Promise<{ db: BackendDbInterface; close(): void }>,
 ): void {
   describe(`${name}: sessions`, async () => {
     let db: BackendDbInterface;
@@ -46,7 +46,7 @@ export function runSessionTests(
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
 
@@ -58,7 +58,7 @@ export function runSessionTests(
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
   });

test/shared/users.ts

@@ -11,7 +11,7 @@ import { hashPassword } from "../../src/util/hash.js";
 export function runUserTests(
   name: string,
   getDb: () => Promise<{ db: DbInterface; close(): void }>,
-  getReadonlyDb?: () => Promise<{ db: DbInterface; close(): void }>
+  getReadonlyDb?: () => Promise<{ db: DbInterface; close(): void }>,
 ): void {
   describe(`${name}: users`, async () => {
     let db: DbInterface;
@@ -57,13 +57,18 @@ export function runUserTests(
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
 
     it("getUserByEmail returns the created user", async () => {
       const email = `user-byemail-${Date.now()}@test.example`;
-      await db.createUser({ email, name: "ByEmail User", password: hashedPw, flags: {} });
+      await db.createUser({
+        email,
+        name: "ByEmail User",
+        password: hashedPw,
+        flags: {},
+      });
       const found = await db.getUserByEmail(email);
       assert.ok("email" in found, "result includes email");
       assert.equal(found.email, email);
@@ -75,7 +80,7 @@ export function runUserTests(
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
 
@@ -100,7 +105,10 @@ export function runUserTests(
         password: hashedPw,
         flags: {},
       });
-      const updated = await db.updateUser({ uid: created.uid, name: "After Update" });
+      const updated = await db.updateUser({
+        uid: created.uid,
+        name: "After Update",
+      });
       assert.equal(updated.uid, created.uid);
       assert.equal(updated.name, "After Update");
     });
@@ -117,7 +125,7 @@ export function runUserTests(
         (err) => {
           assert.ok(err instanceof InvalidAbodeError);
           return true;
-        }
+        },
       );
     });
 
@@ -134,7 +142,7 @@ export function runUserTests(
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
 
@@ -144,7 +152,7 @@ export function runUserTests(
         (err) => {
           assert.ok(err instanceof NotFoundAbodeError);
           return true;
-        }
+        },
       );
     });
   });
@@ -178,7 +186,7 @@ export function runUserTests(
         (err) => {
           assert.ok(err instanceof ReadonlyAbodeError);
           return true;
-        }
+        },
       );
     });
   });

test/tools/authenticate.test.ts

@@ -29,7 +29,7 @@ const MOCK_APIKEY: ClientApikey = {
 };
 
 function makeMockDb(
-  overrides: Partial<BackendDbInterface> = {}
+  overrides: Partial<BackendDbInterface> = {},
 ): BackendDbInterface {
   return {
     readonly: false,
@@ -37,42 +37,97 @@ function makeMockDb(
     name: "mock",
     close: async () => {},
     listUsers: async () => [],
-    getUserById: async () => { throw new NotFoundAbodeError(); },
+    getUserById: async () => {
+      throw new NotFoundAbodeError();
+    },
     deleteUserById: async () => {},
     createUser: async () => MOCK_USER,
     updateUser: async () => MOCK_USER,
-    getUserByEmail: async () => { throw new NotFoundAbodeError(); },
+    getUserByEmail: async () => {
+      throw new NotFoundAbodeError();
+    },
     listAbodes: async () => [],
-    getAbodeById: async () => { throw new NotFoundAbodeError(); },
+    getAbodeById: async () => {
+      throw new NotFoundAbodeError();
+    },
     deleteAbodeById: async () => {},
-    createAbode: async () => ({ aid: "a", name: "A", created_at: "", created_by: null, updated_at: "", updated_by: null }),
-    updateAbode: async () => ({ aid: "a", name: "A", created_at: "", created_by: null, updated_at: "", updated_by: null }),
+    createAbode: async () => ({
+      aid: "a",
+      name: "A",
+      created_at: "",
+      created_by: null,
+      updated_at: "",
+      updated_by: null,
+    }),
+    updateAbode: async () => ({
+      aid: "a",
+      name: "A",
+      created_at: "",
+      created_by: null,
+      updated_at: "",
+      updated_by: null,
+    }),
     listResidents: async () => [],
-    getResidentById: async () => { throw new NotFoundAbodeError(); },
+    getResidentById: async () => {
+      throw new NotFoundAbodeError();
+    },
     deleteResidentById: async () => {},
-    createResident: async () => ({ uid: "", aid: "", flags: {}, created_at: "", created_by: null, updated_at: "", updated_by: null }),
-    updateResident: async () => ({ uid: "", aid: "", flags: {}, created_at: "", created_by: null, updated_at: "", updated_by: null }),
+    createResident: async () => ({
+      uid: "",
+      aid: "",
+      flags: {},
+      created_at: "",
+      created_by: null,
+      updated_at: "",
+      updated_by: null,
+    }),
+    updateResident: async () => ({
+      uid: "",
+      aid: "",
+      flags: {},
+      created_at: "",
+      created_by: null,
+      updated_at: "",
+      updated_by: null,
+    }),
     listResidentsByUserId: async () => [],
     listResidentsByAbodeId: async () => [],
     listUsersByAbodeId: async () => [],
     listAbodesByUserId: async () => [],
     listNotes: async () => [],
-    getNoteById: async () => { throw new NotFoundAbodeError(); },
+    getNoteById: async () => {
+      throw new NotFoundAbodeError();
+    },
     deleteNoteById: async () => {},
-    createNote: async () => { throw new Error("unimplemented"); },
-    updateNote: async () => { throw new Error("unimplemented"); },
+    createNote: async () => {
+      throw new Error("unimplemented");
+    },
+    updateNote: async () => {
+      throw new Error("unimplemented");
+    },
     listNotesByAbodeId: async () => [],
     listNotesByUserId: async () => [],
     deleteSessionsByUser: async () => {},
     listApikeysByUser: async () => [],
-    getApikeyById: async () => { throw new NotFoundAbodeError(); },
-    createApikey: async () => [MOCK_APIKEY, "at_" + "0".repeat(32) as `at_${string}`],
+    getApikeyById: async () => {
+      throw new NotFoundAbodeError();
+    },
+    createApikey: async () => [
+      MOCK_APIKEY,
+      ("at_" + "0".repeat(32)) as `at_${string}`,
+    ],
     deleteApikeyById: async () => {},
-    getUserByLogin: async () => { throw new NotFoundAbodeError(); },
-    getUserBySession: async () => { throw new NotFoundAbodeError(); },
+    getUserByLogin: async () => {
+      throw new NotFoundAbodeError();
+    },
+    getUserBySession: async () => {
+      throw new NotFoundAbodeError();
+    },
     createSession: async () => `as_${"0".repeat(32)}`,
     deleteSession: async () => {},
-    getUserByApikey: async () => { throw new NotFoundAbodeError(); },
+    getUserByApikey: async () => {
+      throw new NotFoundAbodeError();
+    },
     ...overrides,
   };
 }
@@ -92,7 +147,10 @@ type MockCtx = {
   };
 };
 
-function makeMockCtx(headerOverrides: Record<string, string> = {}, cookieOverrides: Record<string, string> = {}): MockCtx {
+function makeMockCtx(
+  headerOverrides: Record<string, string> = {},
+  cookieOverrides: Record<string, string> = {},
+): MockCtx {
   const clearedCookies = new Set<string>();
   const ctx: MockCtx = {
     headers: headerOverrides,
@@ -110,7 +168,10 @@ function makeMockCtx(headerOverrides: Record<string, string> = {}, cookieOverrid
         return cookieOverrides[name];
       },
       set(name: string, value: string, opts?: unknown) {
-        if (value === "" || (opts && (opts as { expires?: Date }).expires?.getFullYear()! < 2000)) {
+        if (
+          value === "" ||
+          (opts && (opts as { expires?: Date }).expires?.getFullYear()! < 2000)
+        ) {
           clearedCookies.add(name);
         }
       },
@@ -121,11 +182,13 @@ function makeMockCtx(headerOverrides: Record<string, string> = {}, cookieOverrid
 
 async function runMiddleware(
   db: BackendDbInterface,
-  ctx: MockCtx
+  ctx: MockCtx,
 ): Promise<boolean> {
   let nextCalled = false;
   const mw = authenticate(db);
-  await mw(ctx as any, async () => { nextCalled = true; });
+  await mw(ctx as any, async () => {
+    nextCalled = true;
+  });
   return nextCalled;
 }
 
@@ -157,7 +220,9 @@ describe("authenticate middleware", () => {
 
     it("wrong password (NotAuthorizedAbodeError) → 401 invalid_password", async () => {
       const db = makeMockDb({
-        getUserByLogin: async () => { throw new NotAuthorizedAbodeError(); },
+        getUserByLogin: async () => {
+          throw new NotAuthorizedAbodeError();
+        },
       });
       const ctx = makeMockCtx({ Authorization: "Basic " + btoa("user:wrong") });
       await runMiddleware(db, ctx);
@@ -167,9 +232,13 @@ describe("authenticate middleware", () => {
 
     it("unknown user (NotFoundAbodeError) → 401 unknown_user", async () => {
       const db = makeMockDb({
-        getUserByLogin: async () => { throw new NotFoundAbodeError(); },
+        getUserByLogin: async () => {
+          throw new NotFoundAbodeError();
+        },
+      });
+      const ctx = makeMockCtx({
+        Authorization: "Basic " + btoa("nobody:pass"),
       });
-      const ctx = makeMockCtx({ Authorization: "Basic " + btoa("nobody:pass") });
       await runMiddleware(db, ctx);
       assert.equal(ctx.status, 401);
       assert.deepEqual((ctx.body as any)?.error, "unknown_user");
@@ -177,7 +246,9 @@ describe("authenticate middleware", () => {
 
     it("ConflictAbodeError (#unset password) → 401 user_not_loggable", async () => {
       const db = makeMockDb({
-        getUserByLogin: async () => { throw new ConflictAbodeError(); },
+        getUserByLogin: async () => {
+          throw new ConflictAbodeError();
+        },
       });
       const ctx = makeMockCtx({ Authorization: "Basic " + btoa("user:pass") });
       await runMiddleware(db, ctx);
@@ -211,7 +282,9 @@ describe("authenticate middleware", () => {
 
     it("invalid/expired at_ token → 401 invalid_apikey", async () => {
       const db = makeMockDb({
-        getUserByApikey: async () => { throw new NotFoundAbodeError(); },
+        getUserByApikey: async () => {
+          throw new NotFoundAbodeError();
+        },
       });
       const ctx = makeMockCtx({ Authorization: `Bearer ${validToken}` });
       await runMiddleware(db, ctx);
@@ -246,17 +319,25 @@ describe("authenticate middleware", () => {
       const db = makeMockDb();
       const ctx = makeMockCtx({}, { abode_session: "not-a-session-token" });
       await runMiddleware(db, ctx);
-      assert.ok(ctx.clearedCookies.has("abode_session"), "cookie should be cleared");
+      assert.ok(
+        ctx.clearedCookies.has("abode_session"),
+        "cookie should be cleared",
+      );
       assert.equal(ctx.status, 401);
     });
 
     it("expired/unknown session token clears cookie and returns 401", async () => {
       const db = makeMockDb({
-        getUserBySession: async () => { throw new NotFoundAbodeError(); },
+        getUserBySession: async () => {
+          throw new NotFoundAbodeError();
+        },
       });
       const ctx = makeMockCtx({}, { abode_session: validToken });
       await runMiddleware(db, ctx);
-      assert.ok(ctx.clearedCookies.has("abode_session"), "cookie should be cleared");
+      assert.ok(
+        ctx.clearedCookies.has("abode_session"),
+        "cookie should be cleared",
+      );
       assert.equal(ctx.status, 401);
     });
   });

test/tools/convertError.test.ts

@@ -25,7 +25,9 @@ describe("convertError middleware", () => {
   it("does not interfere when next succeeds", async () => {
     const ctx = makeCtx();
     let nextCalled = false;
-    await convertError(ctx as any, async () => { nextCalled = true; });
+    await convertError(ctx as any, async () => {
+      nextCalled = true;
+    });
     assert.equal(nextCalled, true);
     assert.equal(ctx.status, 200);
   });

test/tools/export-import.test.ts

@@ -0,0 +1,715 @@
+import { describe, it, before, after } from "node:test";
+import assert from "node:assert/strict";
+import readline from "node:readline";
+import { Readable } from "node:stream";
+import { createServer } from "node:http";
+import type { AddressInfo } from "node:net";
+import Koa from "koa";
+import { createTestDb, type TestDb } from "../helpers/sqlite.js";
+import { apirouter } from "../../src/webapi/apirouter.js";
+import { computeForcedExportFilter } from "../../src/webapi/exportScope.js";
+import {
+  intersectExportFilters,
+  recordAllowed,
+  kindAllowed,
+} from "../../src/db/export/filter.js";
+import { inspectExportStream } from "../../src/db/export/inspect.js";
+import { hashPassword } from "../../src/util/hash.js";
+import type { ClientUser } from "../../src/db/types/User.js";
+
+// ---------------------------------------------------------------------------
+// helpers
+// ---------------------------------------------------------------------------
+
+async function streamToString(s: NodeJS.ReadableStream): Promise<string> {
+  let out = "";
+  for await (const chunk of s) out += chunk;
+  return out;
+}
+
+function parseLines(ndjson: string): { kind: string; data: any }[] {
+  return ndjson
+    .split("\n")
+    .filter(Boolean)
+    .map((l) => JSON.parse(l));
+}
+
+/** Normalise `*_at` fields to epoch ms so formatting never breaks equality. */
+function norm(obj: Record<string, unknown>): Record<string, unknown> {
+  const out: Record<string, unknown> = {};
+  for (const [k, v] of Object.entries(obj)) {
+    out[k] = k.endsWith("_at")
+      ? v == null
+        ? null
+        : new Date(v as string).getTime()
+      : v;
+  }
+  return out;
+}
+function normSorted(
+  arr: Record<string, unknown>[],
+  key: (x: any) => string,
+): Record<string, unknown>[] {
+  return arr.map(norm).sort((a, b) => key(a).localeCompare(key(b)));
+}
+
+interface Seed {
+  admin: ClientUser;
+  normal: ClientUser;
+  co: ClientUser;
+  aid1: string;
+  aid2: string;
+  nid1: string;
+  nid2: string;
+}
+
+async function seed(db: TestDb["db"]): Promise<Seed> {
+  const pw = await hashPassword("password");
+  const admin = await db.createUser({
+    email: "admin@test.example",
+    name: "Admin",
+    password: pw,
+    flags: { admin: true },
+  });
+  const normal = await db.createUser({
+    email: "normal@test.example",
+    name: "Normal",
+    password: pw,
+    flags: {},
+  });
+  const co = await db.createUser({
+    email: "co@test.example",
+    name: "Co Resident",
+    password: pw,
+    flags: {},
+  });
+  const abode1 = await db.createAbode(
+    { name: "Abode One" },
+    { uid: admin.uid },
+  );
+  const abode2 = await db.createAbode(
+    { name: "Abode Two" },
+    { uid: admin.uid },
+  );
+  await db.createResident(
+    { uid: normal.uid, aid: abode1.aid, flags: {} },
+    { uid: admin.uid },
+  );
+  await db.createResident(
+    { uid: co.uid, aid: abode1.aid, flags: {} },
+    { uid: admin.uid },
+  );
+  await db.createResident(
+    { uid: admin.uid, aid: abode2.aid, flags: { admin: true } },
+    { uid: admin.uid },
+  );
+  await db.createApikey({
+    uid: normal.uid,
+    name: "normal key",
+    permissions: {},
+    expires_at: null,
+  });
+  const note1 = await db.createNote(
+    {
+      aid: abode1.aid,
+      name: "Note One",
+      content: "hello",
+      properties: { type: "note" },
+    },
+    { uid: normal.uid },
+  );
+  const note2 = await db.createNote(
+    {
+      aid: abode2.aid,
+      name: "Note Two",
+      content: "world",
+      properties: { type: "note" },
+    },
+    { uid: admin.uid },
+  );
+  return {
+    admin,
+    normal,
+    co,
+    aid1: abode1.aid,
+    aid2: abode2.aid,
+    nid1: note1.nid,
+    nid2: note2.nid,
+  };
+}
+
+// ---------------------------------------------------------------------------
+// 1. round-trip
+// ---------------------------------------------------------------------------
+
+describe("export/import: sqlite -> sqlite round-trip", () => {
+  it("reproduces users, abodes, residents, apikeys, notes", async () => {
+    const src = await createTestDb();
+    const dst = await createTestDb();
+    try {
+      const s = await seed(src.db);
+
+      const result = await dst.db.import(src.db.export());
+      assert.ok(result.counts.user && result.counts.user >= 3);
+      assert.ok(result.counts.note && result.counts.note >= 2);
+
+      assert.deepEqual(
+        normSorted(await dst.db.listUsers(), (u) => u.uid),
+        normSorted(await src.db.listUsers(), (u) => u.uid),
+      );
+      assert.deepEqual(
+        normSorted(await dst.db.listAbodes(), (a) => a.aid),
+        normSorted(await src.db.listAbodes(), (a) => a.aid),
+      );
+      assert.deepEqual(
+        normSorted(await dst.db.listResidents(), (r) => r.uid + r.aid),
+        normSorted(await src.db.listResidents(), (r) => r.uid + r.aid),
+      );
+      // apikeys: token is regenerated on import, so the ClientApikey view
+      // (which omits token) must still match exactly.
+      assert.deepEqual(
+        normSorted(await dst.db.listApikeysByUser(s.normal.uid), (k) => k.kid),
+        normSorted(await src.db.listApikeysByUser(s.normal.uid), (k) => k.kid),
+      );
+      // notes (full, with content)
+      const srcNote = await src.db.getNoteById(s.nid1);
+      const dstNote = await dst.db.getNoteById(s.nid1);
+      assert.deepEqual(norm(dstNote), norm(srcNote));
+    } finally {
+      src.close();
+      dst.close();
+    }
+  });
+});
+
+// ---------------------------------------------------------------------------
+// 2. filter narrowing
+// ---------------------------------------------------------------------------
+
+describe("export/import: filter narrowing", () => {
+  it("scopes abode/resident/note to the requested abodes", async () => {
+    const src = await createTestDb();
+    try {
+      const s = await seed(src.db);
+      const ndjson = await streamToString(
+        src.db.export({ filter: { abodes: [s.aid1] } }),
+      );
+      const lines = parseLines(ndjson);
+
+      const abodeAids = lines
+        .filter((l) => l.kind === "abode")
+        .map((l) => l.data.aid);
+      assert.deepEqual(abodeAids, [s.aid1]);
+
+      const noteAids = new Set(
+        lines.filter((l) => l.kind === "note").map((l) => l.data.aid),
+      );
+      assert.ok(noteAids.has(s.aid1));
+      assert.ok(!noteAids.has(s.aid2));
+
+      const residentAids = new Set(
+        lines.filter((l) => l.kind === "resident").map((l) => l.data.aid),
+      );
+      assert.ok(!residentAids.has(s.aid2));
+    } finally {
+      src.close();
+    }
+  });
+
+  it("imports the narrowed dump into a fresh db with the same scope", async () => {
+    const src = await createTestDb();
+    const dst = await createTestDb();
+    try {
+      const s = await seed(src.db);
+      await dst.db.import(src.db.export({ filter: { abodes: [s.aid1] } }));
+
+      const abodes = await dst.db.listAbodes();
+      assert.deepEqual(
+        abodes.map((a) => a.aid),
+        [s.aid1],
+      );
+      const notes = await dst.db.listNotesByAbodeId(s.aid1);
+      assert.equal(notes.length, 1);
+      assert.equal((await dst.db.listNotesByAbodeId(s.aid2)).length, 0);
+    } finally {
+      src.close();
+      dst.close();
+    }
+  });
+
+  it("kinds filter selects only the requested kinds", async () => {
+    const src = await createTestDb();
+    try {
+      await seed(src.db);
+      const ndjson = await streamToString(
+        src.db.export({ filter: { kinds: ["abode"] } }),
+      );
+      const kinds = new Set(parseLines(ndjson).map((l) => l.kind));
+      assert.ok(kinds.has("abode"));
+      assert.ok(!kinds.has("user"));
+      assert.ok(!kinds.has("note"));
+    } finally {
+      src.close();
+    }
+  });
+});
+
+// ---------------------------------------------------------------------------
+// 3. forced-filter enforcement
+// ---------------------------------------------------------------------------
+
+describe("exportScope: computeForcedExportFilter", () => {
+  it("returns null for a global admin on a basic/session credential", async () => {
+    const t = await createTestDb();
+    try {
+      const s = await seed(t.db);
+      const forced = await computeForcedExportFilter(t.db, {
+        user: s.admin,
+        session: { source: "basic" },
+      });
+      assert.equal(forced, null);
+    } finally {
+      t.close();
+    }
+  });
+
+  it("returns null for a global admin with an unrestricted apikey", async () => {
+    const t = await createTestDb();
+    try {
+      const s = await seed(t.db);
+      const forced = await computeForcedExportFilter(t.db, {
+        user: s.admin,
+        session: {
+          source: "apikey",
+          key: {
+            kid: "k",
+            uid: s.admin.uid,
+            name: "k",
+            permissions: { admin: true, all: true },
+            created_at: new Date().toISOString(),
+            expires_at: null,
+          },
+        },
+      });
+      assert.equal(forced, null);
+    } finally {
+      t.close();
+    }
+  });
+
+  it("forces a non-admin to their abodes + co-residents", async () => {
+    const t = await createTestDb();
+    try {
+      const s = await seed(t.db);
+      const forced = await computeForcedExportFilter(t.db, {
+        user: s.normal,
+        session: { source: "basic" },
+      });
+      assert.ok(forced);
+      assert.deepEqual(forced!.abodes, [s.aid1]);
+      assert.deepEqual(
+        new Set(forced!.users),
+        new Set([s.normal.uid, s.co.uid]),
+      );
+      assert.ok(!forced!.users!.includes(s.admin.uid));
+
+      // A caller requesting a wider abode never gets it: intersection, not union.
+      const effective = intersectExportFilters(
+        { abodes: [s.aid1, s.aid2] },
+        forced,
+      );
+      assert.deepEqual(effective.abodes, [s.aid1]);
+      assert.ok(!effective.abodes!.includes(s.aid2));
+    } finally {
+      t.close();
+    }
+  });
+
+  it("intersects a non-admin apikey with restrict_abodes", async () => {
+    const t = await createTestDb();
+    try {
+      const s = await seed(t.db);
+      const forced = await computeForcedExportFilter(t.db, {
+        user: s.normal,
+        session: {
+          source: "apikey",
+          key: {
+            kid: "k",
+            uid: s.normal.uid,
+            name: "k",
+            permissions: { restrict_abodes: [s.aid2] },
+            created_at: new Date().toISOString(),
+            expires_at: null,
+          },
+        },
+      });
+      // normal resides only in aid1; restrict to aid2 => empty intersection.
+      assert.deepEqual(forced!.abodes, []);
+    } finally {
+      t.close();
+    }
+  });
+});
+
+// ---------------------------------------------------------------------------
+// 4. cancellation, export side
+// ---------------------------------------------------------------------------
+
+describe("export cancellation", () => {
+  it("stops querying tables after the destination aborts", async () => {
+    const t = await createTestDb();
+    try {
+      const pw = await hashPassword("password");
+      // Enough users that the first table can't be buffered in one go, so the
+      // generator backpressures mid-`user` and never reaches later tables.
+      for (let i = 0; i < 400; i++) {
+        await t.db.createUser({
+          email: `bulk-${i}@test.example`,
+          name: `Bulk ${i}`,
+          password: pw,
+          flags: {},
+        });
+      }
+
+      let allCalls = 0;
+      const orig = t.wrapped.all.bind(t.wrapped);
+      (t.wrapped as { all: unknown }).all = (stmt: never) => {
+        allCalls++;
+        return orig(stmt);
+      };
+
+      const ac = new AbortController();
+      const stream = t.db.export({ signal: ac.signal });
+      const rl = readline.createInterface({ input: stream });
+
+      let lines = 0;
+      let callsAtAbort = -1;
+      for await (const _ of rl) {
+        lines++;
+        if (lines === 3) {
+          ac.abort();
+          callsAtAbort = allCalls;
+        }
+      }
+
+      assert.ok(callsAtAbort >= 1, "at least the first table was queried");
+      assert.equal(allCalls, callsAtAbort, "no further queries after abort");
+      assert.ok(allCalls < 5, "did not materialise all five tables");
+    } finally {
+      t.close();
+    }
+  });
+});
+
+// ---------------------------------------------------------------------------
+// 5. cancellation, import side
+// ---------------------------------------------------------------------------
+
+describe("import cancellation", () => {
+  it("rolls back and leaves no dangling transaction when the source errors", async () => {
+    const dst = await createTestDb();
+    try {
+      function line(kind: string, data: unknown): string {
+        return JSON.stringify({ kind, data }) + "\n";
+      }
+      const now = new Date().toISOString();
+      const mkUser = (i: number) => ({
+        uid: crypto.randomUUID(),
+        email: `imp-${i}@test.example`,
+        name: `Imp ${i}`,
+        flags: {},
+        created_at: now,
+        updated_at: now,
+      });
+
+      // Emits a couple of valid user records, then throws mid-stream.
+      const source = Readable.from(
+        (async function* () {
+          yield line("meta", { v: 1 });
+          yield line("user", mkUser(1));
+          yield line("user", mkUser(2));
+          throw new Error("source exploded");
+        })(),
+      );
+
+      await assert.rejects(() => dst.db.import(source), /source exploded/);
+
+      // ROLLBACK happened: nothing persisted.
+      assert.equal((await dst.db.listUsers()).length, 0);
+
+      // No lingering open transaction: a follow-up write succeeds immediately.
+      const pw = await hashPassword("password");
+      const created = await dst.db.createUser({
+        email: "after@test.example",
+        name: "After",
+        password: pw,
+        flags: {},
+      });
+      assert.ok(created.uid);
+    } finally {
+      dst.close();
+    }
+  });
+
+  it("aborts cleanly via signal and commits nothing", async () => {
+    const dst = await createTestDb();
+    try {
+      const ac = new AbortController();
+      const now = new Date().toISOString();
+      const source = Readable.from(
+        (async function* () {
+          yield JSON.stringify({ kind: "meta", data: { v: 1 } }) + "\n";
+          yield JSON.stringify({
+            kind: "user",
+            data: {
+              uid: crypto.randomUUID(),
+              email: "abort@test.example",
+              name: "Abort",
+              flags: {},
+              created_at: now,
+              updated_at: now,
+            },
+          }) + "\n";
+          ac.abort();
+          // Keep the stream alive so abort — not EOF — ends the import.
+          await new Promise((r) => setTimeout(r, 1000));
+        })(),
+      );
+
+      await assert.rejects(() => dst.db.import(source, { signal: ac.signal }));
+      assert.equal((await dst.db.listUsers()).length, 0);
+    } finally {
+      dst.close();
+    }
+  });
+});
+
+// ---------------------------------------------------------------------------
+// 6. api export endpoint
+// ---------------------------------------------------------------------------
+
+describe("GET /export endpoint", () => {
+  let t: TestDb;
+  let s: Seed;
+  let url: string;
+  let close: () => Promise<void>;
+
+  const basic = (email: string) =>
+    "Basic " + Buffer.from(`${email}:password`).toString("base64");
+
+  before(async () => {
+    t = await createTestDb();
+    s = await seed(t.db);
+    const app = new Koa();
+    const router = apirouter(t.db);
+    app.use(router.routes());
+    app.use(router.allowedMethods());
+    const server = createServer(app.callback());
+    await new Promise<void>((r) => server.listen(0, "127.0.0.1", r));
+    const { port } = server.address() as AddressInfo;
+    url = `http://127.0.0.1:${port}`;
+    close = () =>
+      new Promise<void>((resolve, reject) =>
+        server.close((err) => (err ? reject(err) : resolve())),
+      );
+  });
+
+  after(async () => {
+    await close();
+    t.close();
+  });
+
+  it("global admin exports everything", async () => {
+    const res = await fetch(`${url}/export`, {
+      headers: { Authorization: basic(s.admin.email) },
+    });
+    assert.equal(res.status, 200);
+    const lines = parseLines(await res.text());
+    const abodeAids = new Set(
+      lines.filter((l) => l.kind === "abode").map((l) => l.data.aid),
+    );
+    assert.ok(abodeAids.has(s.aid1));
+    assert.ok(abodeAids.has(s.aid2));
+    const userUids = new Set(
+      lines.filter((l) => l.kind === "user").map((l) => l.data.uid),
+    );
+    assert.ok(userUids.has(s.admin.uid));
+    assert.ok(userUids.has(s.normal.uid));
+  });
+
+  it("non-admin is force-scoped even when requesting wider abodes", async () => {
+    const res = await fetch(`${url}/export?abodes=${s.aid1},${s.aid2}`, {
+      headers: { Authorization: basic(s.normal.email) },
+    });
+    assert.equal(res.status, 200);
+    const lines = parseLines(await res.text());
+
+    const abodeAids = new Set(
+      lines.filter((l) => l.kind === "abode").map((l) => l.data.aid),
+    );
+    assert.ok(abodeAids.has(s.aid1));
+    assert.ok(!abodeAids.has(s.aid2), "aid2 forced out of scope");
+
+    const userUids = new Set(
+      lines.filter((l) => l.kind === "user").map((l) => l.data.uid),
+    );
+    assert.ok(userUids.has(s.normal.uid));
+    assert.ok(userUids.has(s.co.uid));
+    assert.ok(!userUids.has(s.admin.uid), "admin not a co-resident of aid1");
+
+    // The meta line records the *effective* (narrowed) filter.
+    const meta = lines.find((l) => l.kind === "meta");
+    assert.ok(meta);
+    assert.deepEqual(meta!.data.filter.abodes, [s.aid1]);
+  });
+
+  it("stops server-side querying shortly after the client aborts", async () => {
+    // Dedicated db/server. Rows are deliberately large (and inserted in bulk so
+    // the seed stays fast) so the users table alone can't fit in the socket
+    // buffer — the export generator backpressures mid-`user` and never reaches
+    // later tables while the client is still holding the connection open.
+    const big = await createTestDb();
+    let server: ReturnType<typeof createServer> | undefined;
+    try {
+      const pw = await hashPassword("password");
+      await big.db.createUser({
+        email: "a@test.example",
+        name: "A",
+        password: pw,
+        flags: { admin: true },
+      });
+      const { sql, db: raw } = big.db._;
+      // ~32MB of user rows — far more than any socket/kernel buffer can hold,
+      // so the generator is guaranteed to still be suspended mid-`user` (never
+      // having queried a later table) when the client aborts.
+      const bigName = "x".repeat(16000);
+      raw.multi(() => {
+        for (let i = 0; i < 2000; i++) {
+          raw.run(sql`
+            INSERT INTO "users"("uid", "email", "name", "flags")
+            VALUES(
+              ${{ uuid: crypto.randomUUID() }},
+              ${{ text: `b-${i}@test.example` }},
+              ${{ text: bigName }},
+              ${{ jsonb: {} }}
+            )
+          `);
+        }
+      });
+
+      let allCalls = 0;
+      const orig = big.wrapped.all.bind(big.wrapped);
+      (big.wrapped as { all: unknown }).all = (stmt: never) => {
+        allCalls++;
+        return orig(stmt);
+      };
+
+      const app = new Koa();
+      app.on("error", () => {}); // swallow the expected ECONNRESET on abort
+      const router = apirouter(big.db);
+      app.use(router.routes());
+      app.use(router.allowedMethods());
+      server = createServer(app.callback());
+      await new Promise<void>((r) => server!.listen(0, "127.0.0.1", r));
+      const { port } = server.address() as AddressInfo;
+
+      const ac = new AbortController();
+      const res = await fetch(`http://127.0.0.1:${port}/export`, {
+        headers: { Authorization: basic("a@test.example") },
+        signal: ac.signal,
+      });
+      const reader = res.body!.getReader();
+      await reader.read(); // first chunk — server has begun streaming users
+      const callsWhileStreaming = allCalls;
+      assert.ok(callsWhileStreaming >= 1, "server queried the first table");
+      ac.abort();
+      await reader.cancel().catch(() => {});
+
+      await new Promise((r) => setTimeout(r, 250));
+      const settled = allCalls;
+      await new Promise((r) => setTimeout(r, 250));
+      assert.equal(allCalls, settled, "no further queries after abort");
+      assert.ok(allCalls < 5, "did not materialise all five tables");
+    } finally {
+      if (server) await new Promise<void>((r) => server!.close(() => r()));
+      big.close();
+    }
+  });
+});
+
+// ---------------------------------------------------------------------------
+// 7. inspect utility
+// ---------------------------------------------------------------------------
+
+describe("inspectExportStream", () => {
+  it("tallies counts and reads meta without a db", async () => {
+    const src = await createTestDb();
+    try {
+      await seed(src.db);
+      const ndjson = await streamToString(src.db.export());
+      const { counts, meta } = await inspectExportStream(
+        Readable.from([ndjson]),
+      );
+      assert.equal(meta?.v, 1);
+      assert.equal(meta?.source, "sqlite");
+      assert.ok((counts.user ?? 0) >= 3);
+      assert.ok((counts.abode ?? 0) >= 2);
+      assert.ok((counts.note ?? 0) >= 2);
+    } finally {
+      src.close();
+    }
+  });
+
+  it("stopAfterKinds short-circuits once every requested kind is seen", async () => {
+    const src = await createTestDb();
+    try {
+      await seed(src.db);
+      const ndjson = await streamToString(src.db.export());
+      const { counts } = await inspectExportStream(Readable.from([ndjson]), {
+        stopAfterKinds: ["user"],
+      });
+      assert.ok((counts.user ?? 0) >= 1);
+      // stopped as soon as the first user was seen, before later kinds.
+      assert.equal(counts.note ?? 0, 0);
+    } finally {
+      src.close();
+    }
+  });
+});
+
+// ---------------------------------------------------------------------------
+// filter unit checks
+// ---------------------------------------------------------------------------
+
+describe("filter helpers", () => {
+  it("kindAllowed respects kinds/excludeKinds", () => {
+    assert.equal(kindAllowed({ kinds: ["abode"] }, "abode"), true);
+    assert.equal(kindAllowed({ kinds: ["abode"] }, "user"), false);
+    assert.equal(kindAllowed({ excludeKinds: ["note"] }, "note"), false);
+    assert.equal(kindAllowed(undefined, "note"), true);
+  });
+
+  it("recordAllowed scopes by aid/uid per kind", () => {
+    assert.equal(
+      recordAllowed({ abodes: ["a1"] }, "abode", { aid: "a1" }),
+      true,
+    );
+    assert.equal(
+      recordAllowed({ abodes: ["a1"] }, "abode", { aid: "a2" }),
+      false,
+    );
+    assert.equal(
+      recordAllowed({ users: ["u1"] }, "apikey", { uid: "u1" }),
+      true,
+    );
+    assert.equal(
+      recordAllowed({ users: ["u1"] }, "apikey", { uid: "u2" }),
+      false,
+    );
+    // abodes allowlist does not constrain user records
+    assert.equal(
+      recordAllowed({ abodes: ["a1"] }, "user", { uid: "u9" }),
+      true,
+    );
+  });
+});

test/tools/jsonBody.test.ts

@@ -8,7 +8,7 @@ import { jsonBody } from "../../src/webapi/middleware/jsonBody.js";
 
 async function request(
   url: string,
-  opts: { method?: string; body?: unknown; contentType?: string } = {}
+  opts: { method?: string; body?: unknown; contentType?: string } = {},
 ): Promise<{ status: number; body: unknown }> {
   const method = opts.method ?? "POST";
   const bodyStr =
@@ -21,18 +21,19 @@ async function request(
   const res = await fetch(url, { method, headers, body: bodyStr });
   const text = await res.text();
   let parsed: unknown;
-  try { parsed = JSON.parse(text); } catch { parsed = text; }
+  try {
+    parsed = JSON.parse(text);
+  } catch {
+    parsed = text;
+  }
   return { status: res.status, body: parsed };
 }
 
 async function makeTestServer() {
-  const failValidator = Object.assign(
-    (_obj: unknown): _obj is never => false,
-    {
-      errors: [{ message: "required" }] as unknown[],
-      schema: { $id: "test-schema", title: "Test", description: "" },
-    }
-  );
+  const failValidator = Object.assign((_obj: unknown): _obj is never => false, {
+    errors: [{ message: "required" }] as unknown[],
+    schema: { $id: "test-schema", title: "Test", description: "" },
+  });
 
   const app = new Koa();
   const router = new KoaRouter();
@@ -48,7 +49,7 @@ async function makeTestServer() {
     async (ctx) => {
       ctx.status = 200;
       ctx.body = { ok: true };
-    }
+    },
   );
 
   router.post(
@@ -57,7 +58,7 @@ async function makeTestServer() {
     async (ctx) => {
       ctx.status = 200;
       ctx.body = { ok: true, body: ctx.request.body };
-    }
+    },
   );
 
   app.use(router.routes());
@@ -69,7 +70,7 @@ async function makeTestServer() {
   const url = `http://127.0.0.1:${port}`;
   const close = () =>
     new Promise<void>((resolve, reject) =>
-      server.close((err) => (err ? reject(err) : resolve()))
+      server.close((err) => (err ? reject(err) : resolve())),
     );
   return { url, close };
 }
@@ -107,11 +108,16 @@ describe("jsonBody middleware", () => {
   });
 
   it("failing validator → 400 jsonchema_validation_failed with schema and errors", async () => {
-    const res = await request(url + "/fail-validate", { body: { any: "thing" } });
+    const res = await request(url + "/fail-validate", {
+      body: { any: "thing" },
+    });
     assert.equal(res.status, 400);
     assert.equal((res.body as any).error, "jsonchema_validation_failed");
     assert.ok((res.body as any).schema, "response includes schema");
-    assert.ok(Array.isArray((res.body as any).errors), "response includes errors");
+    assert.ok(
+      Array.isArray((res.body as any).errors),
+      "response includes errors",
+    );
   });
 
   it("includeParams: param absent from body → merged in", async () => {

tsconfig.json

@@ -1,15 +1,15 @@
 {
-    "compilerOptions": {
-        "rootDir": "src",
-        "strict": true,
-        "verbatimModuleSyntax": true,
-        "moduleResolution": "nodenext",
-        "module": "nodenext",
-        "target": "esnext",
-        "allowImportingTsExtensions": false,
-        "noEmit": true,
-        "sourceMap": true,
-        "jsx": "react-jsxdev"
-    },
-    "include": ["src/**/*.ts","src/**/*.tsx"]
-}
+  "compilerOptions": {
+    "rootDir": "src",
+    "strict": true,
+    "verbatimModuleSyntax": true,
+    "moduleResolution": "nodenext",
+    "module": "nodenext",
+    "target": "esnext",
+    "allowImportingTsExtensions": false,
+    "noEmit": true,
+    "sourceMap": true,
+    "jsx": "react-jsxdev"
+  },
+  "include": ["src/**/*.ts", "src/**/*.tsx"]
+}

tsconfig.test.json

@@ -1,7 +1,7 @@
 {
-    "extends": "./tsconfig.json",
-    "compilerOptions": {
-        "rootDir": "."
-    },
-    "include": ["src/**/*.ts", "src/**/*.tsx", "test/**/*.ts"]
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "rootDir": "."
+  },
+  "include": ["src/**/*.ts", "src/**/*.tsx", "test/**/*.ts"]
 }

webpack.config.ts

@@ -25,8 +25,8 @@ export default async (): Promise<Configuration[]> => {
     process.env.DB_SOURCES === "dynamic"
       ? "dynamic"
       : process.env.DB_SOURCES === "static"
-      ? "static"
-      : "shared";
+        ? "static"
+        : "shared";
 
   let disableDbSqlite = process.env.DISABLE_DB_SQLITE === "1";
   let disableBs3 = disableDbSqlite || process.env.DISABLE_BS3 === "1";
@@ -56,7 +56,7 @@ export default async (): Promise<Configuration[]> => {
     (await readdir(file("./src/bin"))).map((bin) => [
       bin.replace(/\..+$/, ""),
       file(`./src/bin/${bin}`),
-    ])
+    ]),
   );
   for (const bin of Object.keys(binaries)) {
     copies.push({
@@ -93,12 +93,12 @@ export default async (): Promise<Configuration[]> => {
   } else if (dbSources === "static") {
     console.log("Resolving db interfaces statically");
     aliases[file("./src/db/dbSources.ts")] = file(
-      "./src/db/dbSources.static.ts"
+      "./src/db/dbSources.static.ts",
     );
   } else {
     console.log("Resolving db interfaces shared");
     aliases[file("./src/db/dbSources.ts")] = file(
-      "./src/db/dbSources.shared.ts"
+      "./src/db/dbSources.shared.ts",
     );
   }
 
@@ -111,21 +111,21 @@ export default async (): Promise<Configuration[]> => {
   } else if (disableBs3) {
     console.log("Disabling better-sqlite3 sqlite db backend");
     aliases[file("./src/db/sqlite/impl/implementations.ts")] = file(
-      "./src/db/sqlite/impl/implementations.node.ts"
+      "./src/db/sqlite/impl/implementations.node.ts",
     );
     compiledSources.push("sqlite");
   } else if (disableNodeSqlite) {
     console.log("Disabling node:sqlite sqlite db backend");
     aliases[file("./src/db/sqlite/impl/implementations.ts")] = file(
-      "./src/db/sqlite/impl/implementations.bs3.ts"
+      "./src/db/sqlite/impl/implementations.bs3.ts",
     );
     compiledSources.push("sqlite");
   } else {
     console.log(
-      "Enabling sqlite db interface with better-sqlite3 and node:sqlite backends"
+      "Enabling sqlite db interface with better-sqlite3 and node:sqlite backends",
     );
     aliases[file("./src/db/sqlite/impl/implementations.ts")] = file(
-      "./src/db/sqlite/impl/implementations.all.ts"
+      "./src/db/sqlite/impl/implementations.all.ts",
     );
     compiledSources.push("sqlite");
   }
@@ -145,18 +145,18 @@ export default async (): Promise<Configuration[]> => {
   defines.compiledSources = JSON.stringify(compiledSources);
   for (const source of existingSources)
     defines[`compiledSources.${source}`] = JSON.stringify(
-      compiledSources.includes(source)
+      compiledSources.includes(source),
     );
   if (!compiledSources.length) {
     console.warn(
-      "No db interface enabled, the builds will be completely useless"
+      "No db interface enabled, the builds will be completely useless",
     );
     process.exit(1);
   }
 
   // log about the natives we have
   console.log(
-    `Using ${Object.values(natives).filter(Boolean).length} natives:`
+    `Using ${Object.values(natives).filter(Boolean).length} natives:`,
   );
   for (const [key, path] of Object.entries(natives)) {
     if (path) console.log(`- ${key}: ${path}`);