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ops/devops/scripts/rollback-lnm-backfill.js

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+/**
+ * Rollback script for LNM-21-102-DEV legacy advisory backfill migration.
+ * Removes backfilled observations and linksets by querying the backfill_marker field,
+ * then clears the tombstone markers from advisory_raw.
+ *
+ * Usage:
+ *   mongo concelier ops/devops/scripts/rollback-lnm-backfill.js
+ *
+ * Environment variables:
+ *   DRY_RUN - if set to "1", only reports what would be deleted without making changes.
+ *   BATCH_SIZE - optional batch size for deletions (default 500).
+ *
+ * After running this script, delete the migration record:
+ *   db.schema_migrations.deleteOne({ _id: "20251127_lnm_legacy_backfill" })
+ *
+ * Then restart the Concelier service.
+ */
+(function () {
+  var BACKFILL_MARKER = "lnm_21_102_dev";
+
+  function toInt(value, fallback) {
+    var parsed = parseInt(value, 10);
+    return Number.isFinite(parsed) && parsed > 0 ? parsed : fallback;
+  }
+
+  function toBool(value) {
+    return value === "1" || value === "true" || value === true;
+  }
+
+  var dryRun = typeof DRY_RUN !== "undefined" ? toBool(DRY_RUN) : false;
+  var batchSize = typeof BATCH_SIZE !== "undefined" ? toInt(BATCH_SIZE, 500) : 500;
+  var database = db.getName ? db.getSiblingDB(db.getName()) : db;
+  if (!database) {
+    throw new Error("Unable to resolve database handle");
+  }
+
+  print("");
+  print("== LNM-21-102-DEV Backfill Rollback ==");
+  print("Database  : " + database.getName());
+  print("Dry Run   : " + dryRun);
+  print("Batch Size: " + batchSize);
+  print("");
+
+  // Step 1: Count and delete backfilled observations
+  var observationsCollection = database.getCollection("advisory_observations");
+  var observationsFilter = { backfill_marker: BACKFILL_MARKER };
+  var observationsCount = observationsCollection.countDocuments(observationsFilter);
+
+  print("Found " + observationsCount + " backfilled observations to remove.");
+
+  if (!dryRun && observationsCount > 0) {
+    var obsResult = observationsCollection.deleteMany(observationsFilter);
+    print("Deleted " + obsResult.deletedCount + " observations.");
+  }
+
+  // Step 2: Count and delete backfilled linksets
+  var linksetsCollection = database.getCollection("advisory_linksets");
+  var linksetsFilter = { backfill_marker: BACKFILL_MARKER };
+  var linksetsCount = linksetsCollection.countDocuments(linksetsFilter);
+
+  print("Found " + linksetsCount + " backfilled linksets to remove.");
+
+  if (!dryRun && linksetsCount > 0) {
+    var linkResult = linksetsCollection.deleteMany(linksetsFilter);
+    print("Deleted " + linkResult.deletedCount + " linksets.");
+  }
+
+  // Step 3: Clear tombstone markers from advisory_raw
+  var rawCollection = database.getCollection("advisory_raw");
+  var rawFilter = { backfill_marker: BACKFILL_MARKER };
+  var rawCount = rawCollection.countDocuments(rawFilter);
+
+  print("Found " + rawCount + " advisory_raw documents with tombstone markers to clear.");
+
+  if (!dryRun && rawCount > 0) {
+    var rawResult = rawCollection.updateMany(rawFilter, { $unset: { backfill_marker: "" } });
+    print("Cleared tombstone markers from " + rawResult.modifiedCount + " advisory_raw documents.");
+  }
+
+  // Step 4: Summary
+  print("");
+  print("== Rollback Summary ==");
+  if (dryRun) {
+    print("DRY RUN - No changes were made.");
+    print("Would delete " + observationsCount + " observations.");
+    print("Would delete " + linksetsCount + " linksets.");
+    print("Would clear " + rawCount + " tombstone markers.");
+  } else {
+    print("Observations deleted: " + observationsCount);
+    print("Linksets deleted    : " + linksetsCount);
+    print("Tombstones cleared  : " + rawCount);
+  }
+
+  print("");
+  print("Next steps:");
+  print("1. Delete the migration record:");
+  print('   db.schema_migrations.deleteOne({ _id: "20251127_lnm_legacy_backfill" })');
+  print("2. Restart the Concelier service.");
+  print("");
+})();