diff --git a/scripts/mark-migrations-applied.sh b/scripts/mark-migrations-applied.sh
new file mode 100755
index 0000000..ebe7cd6
--- /dev/null
+++ b/scripts/mark-migrations-applied.sh
@@ -0,0 +1,47 @@
+#!/bin/bash
+# =============================================================================
+# Mark Old Migrations as Applied
+# =============================================================================
+# Run this script when the database was set up before migration tracking existed.
+# This marks old migrations as "applied" so only new migrations will run.
+# Usage: ./scripts/mark-migrations-applied.sh
+# =============================================================================
+
+set -e
+
+# Configuration - adjust these if needed
+COMPOSE_FILES="-f docker-compose.yml -f docker-compose.prod.yml --env-file .env.production"
+
+echo "Marking old migrations as applied in migration_history..."
+
+docker compose $COMPOSE_FILES exec -T mongodb mongosh --quiet --eval '
+db = db.getSiblingDB("accessible_video");
+
+// Create migration_history collection if it does not exist
+db.createCollection("migration_history");
+
+// Mark old migrations as already applied
+var oldMigrations = [
+  {version: "2025-08-17-120000", description: "Initial database schema with users, jobs, and audit_logs collections"},
+  {version: "2025-08-17-120001", description: "Index optimization"},
+  {version: "2025-08-17-120002", description: "Audit log schema update"},
+  {version: "2025-10-10-000000", description: "Add auth_provider field to users"},
+  {version: "2025-10-10-000001", description: "Update user schema validator for production role and nullable passwords"}
+];
+
+oldMigrations.forEach(function(m) {
+  db.migration_history.updateOne(
+    {version: m.version},
+    {$setOnInsert: {version: m.version, description: m.description, applied_at: new Date()}},
+    {upsert: true}
+  );
+  print("Marked as applied: " + m.version);
+});
+
+print("");
+print("Done. Current migration history:");
+db.migration_history.find().sort({version: 1}).forEach(printjson);
+'
+
+echo ""
+echo "Old migrations marked as applied. You can now run ./scripts/deploy.sh"