diff --git a/change/@apibara-indexer-002ca4e8-77c3-4c7c-a51d-d95504a20094.json b/change/@apibara-indexer-002ca4e8-77c3-4c7c-a51d-d95504a20094.json
new file mode 100644
index 0000000..71b4eba
--- /dev/null
+++ b/change/@apibara-indexer-002ca4e8-77c3-4c7c-a51d-d95504a20094.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "add reorg aware implementations in sinks",
+  "packageName": "@apibara/indexer",
+  "email": "jadejajaipal5@gmail.com",
+  "dependentChangeType": "patch"
+}
diff --git a/packages/indexer/src/indexer.ts b/packages/indexer/src/indexer.ts
index d15dc3f..3026a6b 100644
--- a/packages/indexer/src/indexer.ts
+++ b/packages/indexer/src/indexer.ts
@@ -178,6 +178,9 @@ export async function run<TFilter, TBlock, TTxnParams>(
 
     await indexer.hooks.callHook("connect:before", { request, options });
 
+    // avoid having duplicate data if it was inserted before the persistence commited the state
+    await sink.invalidateOnRestart(request.startingCursor);
+
     // store main filter, so later it can be merged
     let mainFilter: TFilter;
     if (isFactoryMode) {
diff --git a/packages/indexer/src/internal/testing.ts b/packages/indexer/src/internal/testing.ts
index 4499336..cab31fa 100644
--- a/packages/indexer/src/internal/testing.ts
+++ b/packages/indexer/src/internal/testing.ts
@@ -91,14 +91,17 @@ export class MockSink extends Sink {
     this.write({ data: context.buffer, endCursor });
   }
 
+  async invalidateOnRestart(cursor?: Cursor) {
+    // No Implementation required
+  }
+
   async invalidate(cursor?: Cursor) {
     // TODO: Implement
     throw new Error("Not implemented");
   }
 
   async finalize(cursor?: Cursor) {
-    // TODO: Implement
-    throw new Error("Not implemented");
+    // No Implementation required
   }
 }
 
diff --git a/packages/indexer/src/sink.ts b/packages/indexer/src/sink.ts
index ca094b6..3edfc7d 100644
--- a/packages/indexer/src/sink.ts
+++ b/packages/indexer/src/sink.ts
@@ -16,6 +16,7 @@ export abstract class Sink<TTxnParams = unknown> {
     cb: (params: TTxnParams) => Promise<void>,
   ): Promise<void>;
 
+  abstract invalidateOnRestart(cursor?: Cursor): Promise<void>;
   abstract invalidate(cursor?: Cursor): Promise<void>;
   abstract finalize(cursor?: Cursor): Promise<void>;
 }
@@ -28,6 +29,12 @@ export class DefaultSink extends Sink<unknown> {
     await cb({});
   }
 
+  async invalidateOnRestart(cursor?: Cursor) {
+    consola.info(
+      `Invalidating all rows with cursor > ${cursor?.orderKey} on restart`,
+    );
+  }
+
   async invalidate(cursor?: Cursor) {
     consola.info(`Invalidating cursor ${cursor?.orderKey}`);
   }
diff --git a/packages/indexer/src/sinks/csv.ts b/packages/indexer/src/sinks/csv.ts
index f31893f..df64a7d 100644
--- a/packages/indexer/src/sinks/csv.ts
+++ b/packages/indexer/src/sinks/csv.ts
@@ -99,14 +99,16 @@ export class CsvSink extends Sink {
     await this.write({ data: context.buffer, endCursor });
   }
 
+  async invalidateOnRestart(cursor?: Cursor) {
+    // No Implementation required
+  }
+
   async invalidate(cursor?: Cursor) {
-    // TODO: Implement
-    throw new Error("Not implemented");
+    throw new Error("Reorg for CSV Sink is not implemented");
   }
 
   async finalize(cursor?: Cursor) {
-    // TODO: Implement
-    throw new Error("Not implemented");
+    // No Implementation required
   }
 
   private async insertToCSV(data: SinkData[]) {
diff --git a/packages/indexer/src/sinks/drizzle/drizzle.ts b/packages/indexer/src/sinks/drizzle/drizzle.ts
index 4e160e8..03e1597 100644
--- a/packages/indexer/src/sinks/drizzle/drizzle.ts
+++ b/packages/indexer/src/sinks/drizzle/drizzle.ts
@@ -83,14 +83,19 @@ export class DrizzleSink<
     });
   }
 
+  async invalidateOnRestart(cursor?: Cursor) {
+    await this.invalidate(cursor);
+  }
+
   async invalidate(cursor?: Cursor) {
+    if (cursor?.orderKey === undefined) return;
+
     await this._db.transaction(async (db) => {
       for (const table of this._tables) {
         // delete all rows whose lowerbound of "_cursor" (int8range) column is greater than the invalidate cursor
         await db
           .delete(table)
-          .where(gt(sql`lower(_cursor)`, sql`${Number(cursor?.orderKey)}`))
-          .returning();
+          .where(gt(sql`lower(_cursor)`, sql`${Number(cursor?.orderKey)}`));
         // and for rows whose upperbound of "_cursor" (int8range) column is greater than the invalidate cursor, set the upperbound to infinity
         await db
           .update(table)
@@ -103,8 +108,16 @@ export class DrizzleSink<
   }
 
   async finalize(cursor?: Cursor) {
-    // TODO: Implement
-    throw new Error("Not implemented");
+    if (cursor?.orderKey === undefined) return;
+
+    await this._db.transaction(async (db) => {
+      for (const table of this._tables) {
+        // delete all rows where the upper bound of "_cursor" is less than the finalize cursor
+        await db
+          .delete(table)
+          .where(sql`upper(_cursor) < ${Number(cursor?.orderKey)}`);
+      }
+    });
   }
 }
 
diff --git a/packages/indexer/src/sinks/sqlite.ts b/packages/indexer/src/sinks/sqlite.ts
index f735e9c..4cd4830 100644
--- a/packages/indexer/src/sinks/sqlite.ts
+++ b/packages/indexer/src/sinks/sqlite.ts
@@ -99,14 +99,21 @@ export class SqliteSink extends Sink {
     await this.write({ data: context.buffer, endCursor });
   }
 
+  async invalidateOnRestart(cursor?: Cursor) {
+    await this.invalidate(cursor);
+  }
+
   async invalidate(cursor?: Cursor) {
-    // TODO: Implement
-    throw new Error("Not implemented");
+    if (cursor?.orderKey === undefined) return;
+
+    const cursorValue = Number(cursor.orderKey);
+
+    const sql = `DELETE FROM ${this._config.tableName} WHERE ${this._config.cursorColumn ?? "_cursor"} > ?`;
+    this._db.prepare(sql).run(cursorValue);
   }
 
   async finalize(cursor?: Cursor) {
-    // TODO: Implement
-    throw new Error("Not implemented");
+    // No Implementation required
   }
 
   private async insertJsonArray(data: SinkData[]) {