diff --git a/src/indexer/db.ts b/src/indexer/db.ts
index a0f6057..6503b4f 100644
--- a/src/indexer/db.ts
+++ b/src/indexer/db.ts
@@ -1149,6 +1149,47 @@ export async function insertEventBatchLocked(
   });
 }
 
+/**
+ * Insert a batch of events WITHOUT touching the live indexer_state ledger
+ * pointer. Used for custom historical event imports (event_type_filter's
+ * dynamic start/end ledger support) so a backfill over an arbitrary past
+ * range can never advance or rewind last_ledger_sequence - only the live
+ * poller (insertEventBatch, driven strictly by lastLedger+1..currentLedger)
+ * is allowed to move that pointer. Rows still go through INSERT OR IGNORE
+ * against the same UNIQUE(contract_id, ledger_sequence, event_type)
+ * constraint, so re-running a historical import is idempotent exactly like
+ * the live poller.
+ *
+ * Returns the number of rows actually inserted (excludes rows ignored as
+ * duplicates).
+ */
+export function insertHistoricalEventBatch(events: EventRow[]): number {
+  const db = getDb();
+
+  const insertStmt = db.prepare(`
+    INSERT OR IGNORE INTO events
+    (contract_id, event_type, ledger_sequence, timestamp, data_json)
+    VALUES (?, ?, ?, ?, ?)
+  `);
+
+  const batchTransaction = db.transaction(() => {
+    let inserted = 0;
+    for (const ev of events) {
+      const result = insertStmt.run(
+        ev.contractId,
+        ev.eventType,
+        ev.ledgerSequence,
+        ev.timestamp,
+        ev.dataJson
+      );
+      if (result.changes > 0) inserted++;
+    }
+    return inserted;
+  });
+
+  return batchTransaction();
+}
+
 // ---------------------------------------------------------------------------
 // Event queries
 // ---------------------------------------------------------------------------