feat: complete shared database tenant sharding

docs/IM-群聊业务表设计.sql

@@ -244,20 +244,5 @@ CREATE TABLE IF NOT EXISTS im_group_admin_logs (
   INDEX idx_im_group_admin_logs_object (object_type, object_id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
 
--- 11. Group operation idempotency.
--- This can later be replaced by a global HTTP idempotency table.
-CREATE TABLE IF NOT EXISTS im_group_idempotency (
-  id              BIGINT NOT NULL AUTO_INCREMENT,
-  user_id         BIGINT NOT NULL,
-  method          VARCHAR(8) NOT NULL,
-  route           VARCHAR(256) NOT NULL,
-  idempotency_key VARCHAR(128) NOT NULL,
-  body_hash       CHAR(64) NOT NULL,
-  result_code     INT NOT NULL DEFAULT 0,
-  result_body     JSON,
-  created_at      DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
-  updated_at      DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
-  PRIMARY KEY (id),
-  UNIQUE INDEX uk_im_group_idempotency_request (user_id, method, route, idempotency_key),
-  INDEX idx_im_group_idempotency_created (created_at)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
+-- 11. Group operation idempotency is handled by Redis-backed HTTP idempotency.
+DROP TABLE IF EXISTS im_group_idempotency;