feat: support Bun bundled SQLite runtime

[Arul-]

Summary

• use Bun's bundled bun:sqlite as the first synchronous SQLite driver
• preserve better-sqlite3, node:sqlite, and sql.js fallback behavior
• resolve sql-wasm.wasm from the installed package for global/Bun layouts
• let the Bun CLI spawn the server with Bun instead of the node executable and incompatible V8 flags
• make CLI setup/backup and OmniRoute credential storage work with Bun SQLite
• add Bun CRUD, named-parameter, transaction, pragma, and close coverage

Why

A global Bun install can contain a valid OmniRoute runtime and sql.js, but the current serve preflight exits on the incompatible bundled better-sqlite3 binary before the existing fallback chain is reached. The fallback also assumed cwd/node_modules/sql.js, which is not true for Bun's global install layout.

Verification

• bun test tests/unit/db-adapters/bunSqliteAdapter.test.ts tests/unit/db-adapters/nodeSqliteShared.test.ts passes
• bun test tests/unit/db-adapters/driverFactory.test.ts passes with the installed sql.js package linked into the isolated checkout
• direct Bun CRUD probe selects bun:sqlite
• global-install sql.js probe successfully locates and loads sql-wasm.wasm
• Bun syntax/import checks pass for the modified CLI modules

The full upstream suite was not run because this isolated checkout intentionally has no dependency tree installed; the repository currently declares Node as its supported engine.

[gemini-code-assist]

Code Review

This pull request introduces support for the native bun:sqlite driver when running under the Bun runtime, updating the database adapters, CLI helpers, and adding corresponding unit tests. The review feedback highlights several critical issues: first, bun:sqlite lacks a .prepare() method, meaning direct calls in src/lib/db/omp.ts will crash unless wrapped; second, using db.serialize() for backing up physical databases poses a significant out-of-memory risk and should be replaced with a standard checkpoint and file copy; and third, the parameter normalization in bin/cli/sqlite.mjs needs to explicitly skip Uint8Array and Buffer instances to prevent binary data corruption.

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[gemini-code-assist]

The bun:sqlite Database class does not have a .prepare() method (it uses .query()). Directly calling db.prepare(...) on a bun:sqlite instance will throw a runtime TypeError: db.prepare is not a function and crash the application under Bun. We should wrap the database instance when running under Bun to provide a compatible .prepare() method.

const Database = process.versions.bun
  ? _require("bun:sqlite").Database
  : _require("better-sqlite3");

function openDb(dbPath: string, readonly = false) {
  const opts = readonly ? { readonly: true } : { readwrite: true, create: true };
  const db = new Database(dbPath, opts);
  if (process.versions.bun) {
    return {
      prepare(sql: string) {
        const query = db.query(sql);
        return {
          get(...params: any[]) { return query.get(...params); },
          run(...params: any[]) { return query.run(...params); },
        };
      },
      close() { db.close(); }
    };
  }
  return db;
}

[gemini-code-assist]

Use the openDb helper to safely instantiate the database with Bun compatibility.

Suggested change

	const db = new Database(dbPath, databaseOptions(true));
	const db = openDb(dbPath, true);

[gemini-code-assist]

Use the openDb helper to safely instantiate the database with Bun compatibility.

Suggested change

	const db = new Database(dbPath, databaseOptions());
	const db = openDb(dbPath);

[gemini-code-assist]

Use the openDb helper to safely instantiate the database with Bun compatibility.

Suggested change

	const db = new Database(dbPath, databaseOptions());
	const db = openDb(dbPath);

[gemini-code-assist]

Using db.serialize() for physical file-backed databases is highly inefficient and poses a significant Out Of Memory (OOM) risk for large databases because it loads the entire database into memory as a Uint8Array. Since filePath is already verified to not be ":memory:", we should perform a standard checkpoint and use fs.copyFileSync directly.

    async backup(destination: string): Promise<void> {
      if (filePath === ":memory:") return;
      try {
        db.exec("PRAGMA wal_checkpoint(TRUNCATE)");
      } catch {}
      fs.copyFileSync(filePath, destination);
    },

[gemini-code-assist]

Using db.serialize() for physical file-backed databases is highly inefficient and poses a significant Out Of Memory (OOM) risk for large databases because it loads the entire database into memory as a Uint8Array. Since sourcePath is a physical file, we should perform a standard checkpoint and use fs.copyFileSync directly.

    if (typeof db.backup === "function") {
      await db.backup(destPath);
    } else {
      try {
        db.exec("PRAGMA wal_checkpoint(TRUNCATE)");
      } catch {}
      fs.copyFileSync(sourcePath, destPath);
    }

[gemini-code-assist]

In normalizeParams, there is no check for Uint8Array or Buffer. If a binary parameter (such as an encrypted credential or hash) is passed as a Buffer or Uint8Array, typeof params[0] === "object" will be true, and it is not an Array, so it will enter the loop and attempt to expand its indexed properties (e.g., @0, :0, $0), corrupting the binary data. We should explicitly check and skip normalization for Uint8Array and Buffer instances.

  const normalizeParams = (params) => {
    if (
      params.length !== 1 ||
      params[0] === null ||
      typeof params[0] !== "object" ||
      Array.isArray(params[0]) ||
      params[0] instanceof Uint8Array ||
      (typeof Buffer !== "undefined" && Buffer.isBuffer(params[0]))
    ) {
      return params;
    }
    const expanded = {};
    for (const [key, value] of Object.entries(params[0])) {
      if (/^[:@$]/.test(key)) expanded[key] = value;
      else {
        expanded['@' + key] = value;
        expanded[':' + key] = value;
        expanded['$' + key] = value;
      }
    }
    return [expanded];
  };

[diegosouzapw]

Thanks for this — the bun:sqlite adapter itself is clean (typechecks, lints, and the existing db/omp.test.ts + driverFactory.test.ts pass unmodified against your changes), and the sql.js WASM-resolution fix for global installs is a good catch independent of the Bun work.

Before this can merge there's one policy question and a few concrete fixes needed:

1. Policy: this repo's CLAUDE.md currently states Bun is a build/dev-script runner only and explicitly says not to widen it into "the published runtime" — which is exactly what serve.mjs/processSupervisor.mjs/sqlite.mjs now do when process.versions.bun is set. That's a call for @diegosouzapw to make explicitly (update the doc, or we scope this down) before it ships as real behavior.
2. Backup ordering (robustness): bunSqliteAdapter.ts::backup() and bin/cli/sqlite.mjs::backupSqliteFile() both try db.serialize() (loads the whole DB into memory) before falling back to checkpoint+file-copy for on-disk databases. Bun has a tracked OOM issue on db.serialize() even for tiny in-memory DBs (Out of memory error using (empty) in-memory sqlite db on db.serialize oven-sh/bun#6549) — for a real multi-GB storage.sqlite, checkpoint+copy should be tried first and serialize reserved for :memory: only.
3. Test coverage: I ran node --import tsx/esm --test tests/unit/db-adapters/bunSqliteAdapter.test.ts and got 1 test / 0 pass / 1 skipped — since this repo's CI runs test:unit under Node only, the new adapter has zero CI-exercised coverage right now. Pulling the pure param-normalization/pragma helpers out into Node-testable functions (or wiring a Bun-driven CI job) would close that gap.
4. Minor drift: bin/cli/sqlite.mjs's normalizeParams() doesn't exclude Uint8Array/Buffer before expanding a single object param into named placeholders, unlike the TS adapter's version which does. Not reachable today (no current caller passes a Buffer), but worth aligning so it doesn't bite the next BLOB caller.

One correction to the automated review above: bun:sqlite's Database.prepare() does exist (per Bun's own API reference) and returns a run/get/all Statement, so omp.ts's direct usage is fine as written — no crash there.

Happy to help iterate on 1-4 once there's a steer on the policy question.

[diegosouzapw]

Thanks for the follow-up work here — the bug-fix commit (Bun SQLite backups + params hardening) already addressed the review feedback, so the code side of this PR was in good shape.

The one remaining gap was in CLAUDE.md's policy language, not in the implementation: the previous wording read as "Bun is also a supported runtime for the published CLI/server," which conflicts with this project's actual runtime policy and quietly dropped three existing guardrails (the enumerated allowlist of gate/generator scripts, the explicit "do not widen Bun to npm install/build/pack-artifact/published runtime/test runners" ban, and the byte-identical validation requirement for any new Bun-invoking script).

I pushed a small doc-only commit to this branch that keeps your code untouched and rewrites just those two CLAUDE.md bullets:

• Node remains the only supported runtime for the published omniroute CLI, server, and test suites.
• The bun:sqlite path you added is documented as a best-effort compatibility path (so bun install -g omniroute can start without better-sqlite3), not a supported runtime — with the existing guardrails restored and test:bun:db referenced as its regression suite.

None of your src/, bin/, or test files were touched — only CLAUDE.md. I re-ran typecheck, the file-size and docs-sync gates, test:bun:db, and the driverFactory/cliSqlite test files locally; all green.

With that, this looks ready for the merge queue. Thanks again for the contribution!

[gemini-code-assist]

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[diegosouzapw]

Validated in local merge-train on tomni-proxmox-113 @ db6718332763af295ec8374913f1f5eb7641734f (FAST gates green: static + changed tests + vitest)

[Arul-]

Thanks for raising the size concern. I rechecked the merged patch and the 460 added lines break down as follows:

• 151 lines: the Bun SQLite adapter, which maps Bun's query/run/get/all API onto OmniRoute's existing SqliteAdapter contract, including parameter normalization, transactions, pragmas, backup/checkpoint, lifecycle, and result normalization.
• 77 lines: the CLI SQLite bridge, which needs a separate runtime boundary from the TypeScript adapter.
• 54 lines: driver selection, Bun process spawning, OMP credential DB access, sql.js WASM resolution, and error reporting.
• 132 lines: focused Bun/CLI regression tests.
• 37 lines: CI, package wiring, and policy documentation.

The implementation intentionally preserves the existing Node driver/fallback chain and keeps Bun compatibility isolated behind the existing adapter contract. The backup path was changed to checkpoint and copy on-disk files rather than serializing them into memory. The dedicated Bun test job is necessary because the normal Node test suite skips Bun-only behavior.

There is some duplicated normalization/backup glue between the CLI and TypeScript boundaries, but extracting it would introduce a cross-package runtime dependency and would not materially reduce the patch. The remaining lines are therefore mostly contract adaptation and executable coverage rather than incidental complexity. Bun remains documented as a best-effort compatibility path, not a new supported published runtime.