fix(local): repair bigint columns left in SQLite's integer storage class

[RhysSullivan]

Fixes #1771

A desktop install lost every saved integration from the MCP gateway at once. Restarting did not bring them back. The credentials were never deleted: the gateway could not read the table they live in, so it served an empty tool list.

connection.expires_at records when an OAuth access token expires. It used to be a plain number and now holds the value's digits, because a millisecond timestamp is larger than a 32-bit integer. SQLite does not rewrite existing rows when a column's declared type changes, so a connection saved by an older build still held the old form. Reading it back failed, and the failure happened while mapping the row — so it failed the whole query, not that one field. One stale row hid every integration.

The diagnostics show the same throw 647 times, always on the epoch-millis value.

The fix

A boot-time data migration converts those values to the current form. It is registered first in the local and self-host registries, so it runs before anything reads the affected tables, and the integrations are back on the first restart after upgrading.

It is deliberately narrow. It touches only columns the schema declares bigint, and within them only values whose SQLite storage class is numeric — the shapes the reader cannot handle. Values already in the current form, and the text form the v1 to v2 migration writes, are left exactly as they are. It runs once, inside a transaction, and is a no-op on a second run.

The column list is derived from the schema rather than hand-written, so a column added later cannot be missed.

Tests

• packages/core/sdk/src/sqlite-bigint-storage-class-migration.test.ts — plants the legacy value against the real SQLite bring-up and asserts the read throws, then that the migration repairs it, leaves healthy and null rows alone, is idempotent, and covers every bigint column the schema declares.
• apps/local/src/db/legacy-bigint-boot.test.ts — the wiring: a database file with a legacy row is unreadable, the local registry heals it, and it stays readable across a reboot.

Removing the registry entry fails the boot tests with the exact error from the report.

typecheck, lint, and format:check are clean. The pre-existing SIGKILL-recovery failures in apps/local/src/db reproduce identically on main.

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