fix: align message revision schema with tenant databases

server/db/mysql/adapter.go

@@ -1395,7 +1395,6 @@ func upgradeIMMessageActions(a *adapter) error {
 		"ALTER TABLE im_messages ADD COLUMN recalled_by BIGINT AFTER recalled_at",
 		`CREATE TABLE im_message_revisions(
 			id          BIGINT NOT NULL AUTO_INCREMENT,
-			tenant_id   BIGINT NOT NULL,
 			createdat   DATETIME(3) NOT NULL,
 			updatedat   DATETIME(3) NOT NULL,
 			topic       CHAR(25) NOT NULL,
@@ -1406,8 +1405,7 @@ func upgradeIMMessageActions(a *adapter) error {
 			content     JSON,
 			reason      VARCHAR(256) NOT NULL DEFAULT '',
 			PRIMARY KEY(id),
-			UNIQUE INDEX uk_im_message_revisions_version(tenant_id, topic, seqid, version),
-			CONSTRAINT fk_im_message_revisions_tenant FOREIGN KEY(tenant_id) REFERENCES im_tenant(id) ON DELETE CASCADE
+			UNIQUE INDEX uk_im_message_revisions_version(topic, seqid, version)
 		)`,
 	}
 	for _, stmt := range statements {