fix(powersync-db-collection): "id" in trigger WHEN clauses breaks DELETE for on-demand PowerSync collections

[Chriztiaan]

🎯 Changes

Addresses #1458.

When compileSQLite builds WHEN clauses for diff-tracking triggers on on-demand sync collections, it correctly emits json_extract(OLD.data, '$.column_name') for regular columns but falls through to a bare "id" for the id column - missing the required OLD./NEW. prefix. SQLite can't resolve an unqualified column reference inside a trigger body, so the diff-tracking triggers silently fail and DELETE operations never reach the PowerSync CRUD queue.

Because no error is thrown, the failure is invisible. Deleted rows disappear from TanStack DB's in-memory state as expected, but since the delete isn't persisted to SQLite, the rows reappear after the next sync cycle. This affects any on-demand collection whose stream WHERE clause references id.

As mentioned in the original issue, the minimal fix is to extract the OLD/NEW prefix from jsonColumn when falling through for the id column. I have also added a few tests to verify that the data correctly enters the upload queue.

The issue touches on making the prefixes configurable, but I don't think that is needed at the moment.

✅ Checklist

• I have tested this code locally with pnpm test.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.

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commit: 53bd45f