fix(collection): improve index creation resilience and add collection integrity checks

ts/classes.doc.ts

@@ -597,6 +597,17 @@ export class SmartDataDbDoc<T extends TImplements, TImplements, TManager extends
     return await collection.getCount(filterArg);
   }
 
+  /**
+   * Runs an integrity check on this collection.
+   * Returns a summary with estimated vs actual counts and any duplicate unique fields.
+   */
+  public static async checkCollectionIntegrity<T>(
+    this: plugins.tsclass.typeFest.Class<T>,
+  ) {
+    const collection: SmartdataCollection<T> = (this as any).collection;
+    return await collection.checkCollectionIntegrity();
+  }
+
   /**
    * Create a MongoDB filter from a Lucene query string
    * @param luceneQuery Lucene query string