The issue and MR ingestion paths previously inserted labels, assignees,
and reviewers one row at a time inside a transaction. For entities with
many labels or assignees, this issued N separate SQLite statements where
a single multi-row INSERT suffices.
Replace the per-row loops with batch INSERT functions that build a
single `INSERT OR IGNORE ... VALUES (?1,?2),(?1,?3),...` statement per
chunk. Chunks are capped at 400 rows (BATCH_LINK_ROWS_MAX) to stay
comfortably below SQLite's default 999 bind-parameter limit.
Affected paths:
- issues.rs: link_issue_labels_batch_tx, insert_issue_assignees_batch_tx
- merge_requests.rs: insert_mr_labels_batch_tx,
insert_mr_assignees_batch_tx, insert_mr_reviewers_batch_tx
New tests verify deduplication (OR IGNORE), multi-chunk correctness,
and equivalence with the old per-row approach. A perf benchmark
(bench_issue_assignee_insert_individual_vs_batch) demonstrates the
speedup across representative assignee set sizes.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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