fix(db): add FK constraints, indexes, transaction fixes, and hook_executions tenant isolation (migrations 082-083) (#1246)

Co-authored-by: Bruno Clermont <bruno.clermont@gmail.com>

internal/store/sqlitestore/tracing.go

@@ -314,14 +314,16 @@ func (s *SQLiteTracingStore) GetCostSummary(ctx context.Context, opts store.Cost
 }
 
 // DeleteTracesOlderThan deletes traces and their spans older than cutoff.
+// SQLite's spans.trace_id has no FK reference to traces(id), so spans must be
+// deleted explicitly before the parent traces to avoid leaving orphaned span rows.
+// Returns total traces deleted.
 func (s *SQLiteTracingStore) DeleteTracesOlderThan(ctx context.Context, cutoff time.Time) (int64, error) {
-	// Delete spans belonging to old traces.
+	// Delete spans first — SQLite has no CASCADE on spans.trace_id.
 	_, err := s.db.ExecContext(ctx,
 		`DELETE FROM spans WHERE trace_id IN (SELECT id FROM traces WHERE created_at < ?)`, cutoff)
 	if err != nil {
 		return 0, fmt.Errorf("delete old spans: %w", err)
 	}
-
 	res, err := s.db.ExecContext(ctx, `DELETE FROM traces WHERE created_at < ?`, cutoff)
 	if err != nil {
 		return 0, fmt.Errorf("delete old traces: %w", err)