perf: drain SQLite operations through a native FIFO

[chrispader]

On a single open database, each async query used to wait for its predecessor's result to return through JavaScript before submitting native work. Batches and file imports had the same gap, and setImmediate delayed each handoff. This PR submits async queries, batches, and file imports directly to a native FIFO on the connection while retaining the JavaScript queue for transaction callbacks and lifecycle guards.

One native worker drains each connection's jobs in submission order. A batch or file import remains one atomic native job. The JavaScript queue waits for earlier jobs before starting a transaction callback and holds later jobs until it commits or rolls back. Synchronous transaction methods reject while tx.executeAsync is pending; if the callback exits with pending queries, it waits for them and rolls back. An exception while settling one native promise no longer strands later jobs. Synchronous operations and close still report a busy connection while work is pending.

This branch targets main independently of #364. The iOS build job uses a generic simulator destination so it can compile without a named simulator installed on its runner.

Reproduction

The device harness holds a transaction after an insert, submits 24 external writes, then rolls back. The transaction's row disappears and all 24 external rows remain. Another case submits 24 writes before a transaction and checks that the transaction sees every row.

The harness also checks 64 native async inserts for submission order, verifies that a failed batch rolls back without affecting async statements on either side, and confirms that a failed native query does not stop the FIFO. Unit tests cover pending transaction queries and immediate submission of batches and file imports.

The scheduling change addresses the Promise.all workload in the Expensify App review. An Expensify App TTI comparison on low-end iOS and Android devices remains necessary to measure its effect on startup.

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Project	Deployment	Actions	Updated
react-native-nitro-sqlite	Ready	Preview	Sep 23, 2026 12:11pm UTC