diff --git a/apps/api/src/db/base.py b/apps/api/src/db/base.py
index 3aa243e7..c3ab124c 100644
--- a/apps/api/src/db/base.py
+++ b/apps/api/src/db/base.py
@@ -222,17 +222,19 @@ async def init_db() -> None:
 
         # 2026-04-15 ogt + Claude Sonnet 4.6（亞太）: Phase 6 自我治理閉環
         # ADR-087: ai_governance_events 不可變 Event Sourcing 表
-        # create_all 已建表，此處補 INDEX（部分環境 create 不跑 Index）
-        await conn.execute(
-            text("""
-            CREATE INDEX IF NOT EXISTS ix_ai_governance_event_type
-                ON ai_governance_events (event_type);
-            CREATE INDEX IF NOT EXISTS ix_ai_governance_triggered_at
-                ON ai_governance_events (triggered_at);
-            CREATE INDEX IF NOT EXISTS ix_ai_governance_resolved
-                ON ai_governance_events (resolved);
-            """)
-        )
+        # asyncpg 不允許 prepared statement 內多條指令，必須分開 execute
+        await conn.execute(text(
+            "CREATE INDEX IF NOT EXISTS ix_ai_governance_event_type "
+            "ON ai_governance_events (event_type);"
+        ))
+        await conn.execute(text(
+            "CREATE INDEX IF NOT EXISTS ix_ai_governance_triggered_at "
+            "ON ai_governance_events (triggered_at);"
+        ))
+        await conn.execute(text(
+            "CREATE INDEX IF NOT EXISTS ix_ai_governance_resolved "
+            "ON ai_governance_events (resolved);"
+        ))
 
 
 async def close_db() -> None: