Ingestion counters (discussions_upserted, notes_upserted,
discussions_fetched, diffnotes_count) were incremented before
tx.commit(), meaning a failed commit would report inflated
metrics. Counters now increment only after successful commit
so reported numbers accurately reflect persisted state.
Also simplifies the stale-removal guard in issue discussions:
the received_first_response flag was unnecessary since an empty
seen_discussion_ids list is safe to pass to remove_stale -- if
there were no discussions, stale removal correctly sweeps all
previously-stored discussions. The two separate code paths
(empty vs populated) are collapsed into a single branch.
Derives Default on IngestResult to eliminate verbose zero-init.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Adds complete merge request ingestion pipeline with a novel two-phase
discussion sync strategy optimized for throughput.
New modules:
- merge_requests.rs: MR upsert with labels/assignees/reviewers handling,
stale MR cleanup, and watermark-based incremental sync
- mr_discussions.rs: Parallel prefetch strategy for MR discussions
Two-phase MR discussion sync:
1. PREFETCH PHASE: Spawn concurrent tasks to fetch discussions for
multiple MRs simultaneously (configurable concurrency, default 8).
Transform and validate in parallel, storing results in memory.
2. WRITE PHASE: Serial database writes to avoid lock contention.
Each MR's discussions written in a single transaction, with
proper stale discussion cleanup.
This approach achieves ~4-8x throughput vs serial fetching while
maintaining database consistency. Transform errors are tracked per-MR
to prevent partial writes from corrupting watermarks.
Orchestrator updates:
- ingest_merge_requests(): Coordinates MR fetch -> discussion sync flow
- Progress callbacks emit MR-specific events for UI feedback
- Respects --full flag to reset discussion watermarks for full resync
The prefetch strategy is critical for MRs which typically have more
discussions than issues, and where API latency dominates sync time.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
