infra: fix cassandra (prepared stmt) + neo4j (drop APOC, grouped MERGE) generators

infra/airflow/scripts/generate_cassandra_telemetry_data.py

@@ -51,37 +51,18 @@ def main():
     print(f"Generating {TARGET_ROWS} device metrics...")
     print(f"Batch size: {BATCH_SIZE}")
     
+    insert_stmt = session.prepare(
+        f"INSERT INTO {KEYSPACE}.{TABLE_NAME} (device_id, metric_ts, metric_type, metric_value, payload) "
+        f"VALUES (?, ?, ?, ?, ?)"
+    )
+
     total_generated = 0
-    batch = []
-    
     for i in range(TARGET_ROWS):
-        batch.append(generate_fake_device_metric())
-        
-        if len(batch) >= BATCH_SIZE:
-            session.execute(
-                f"""
-                INSERT INTO {KEYSPACE}.{TABLE_NAME} (device_id, metric_ts, metric_type, metric_value, payload)
-                VALUES (%s, %s, %s, %s, %s)
-                """,
-                batch
-            )
-            total_generated += len(batch)
-            batch = []
-            
-            if total_generated % 100000 == 0:
-                print(f"Generated {total_generated} rows...")
-    
-    # Insert remaining rows
-    if batch:
-        session.execute(
-            f"""
-            INSERT INTO {KEYSPACE}.{TABLE_NAME} (device_id, metric_ts, metric_type, metric_value, payload)
-            VALUES (%s, %s, %s, %s, %s)
-            """,
-            batch
-        )
-        total_generated += len(batch)
-    
+        session.execute(insert_stmt, generate_fake_device_metric())
+        total_generated += 1
+        if total_generated % 1000 == 0:
+            print(f"Generated {total_generated} rows...")
+
     session.shutdown()
     cluster.shutdown()