Populates the agent_metrics table from existing agent_log_chunks data after
the schema migration. Reads chunks in batches of 500, accumulates per-agent
counts in memory, then upserts with additive ON CONFLICT DO UPDATE to match
the ongoing insertChunk write-path behavior.
- apps/server/scripts/backfill-metrics.ts: core backfillMetrics(db) + CLI wrapper backfillMetricsFromPath(dbPath)
- apps/server/scripts/backfill-metrics.test.ts: 8 tests covering all chunk types, malformed JSON, isolation, empty DB, and re-run double-count behavior
- apps/server/cli/index.ts: new top-level `cw backfill-metrics [--db <path>]` command
- docs/database-migrations.md: Post-migration backfill scripts section documenting when and how to run the script
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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