refactor(db): normalize asn prefix cache and ttl cleanup

Строки asn_prefix_cache_row; периодический prune через evobgp-ingest.

Co-authored-by: Cursor <[email protected]>

internal/repository/maintenance.go

@@ -0,0 +1,29 @@
+package repository
+
+import (
+	"context"
+	"time"
+)
+
+const (
+	jobAuditRetentionDays = 90
+	asnCacheRetentionDays = 7
+)
+
+// RunPeriodicMaintenance prunes stale job_audit and asn_prefix_cache rows (PostgreSQL).
+func (p *Postgres) RunPeriodicMaintenance(ctx context.Context) {
+	if p == nil || p.pool == nil {
+		return
+	}
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	jobCutoff := time.Now().UTC().Add(-time.Duration(jobAuditRetentionDays) * 24 * time.Hour)
+	_, _ = p.pool.Exec(ctx, `
+		DELETE FROM job_audit
+		WHERE created_at < $1
+		  AND status IN ('succeeded', 'failed', 'cancelled')`, jobCutoff)
+	asnCutoff := time.Now().UTC().Add(-time.Duration(asnCacheRetentionDays) * 24 * time.Hour)
+	_, _ = p.pool.Exec(ctx, `
+		DELETE FROM asn_prefix_cache WHERE fetched_at < $1`, asnCutoff)
+}