chore(migrations): m0022 pipeline_conversations collation统一unicode_ci——归籍pipeline-service配套;该表此前general_ci漂移(project_capability里COLLATE补丁即为此而生),转换后与sd_iterations等unicode_ci表JOIN无需显式COLLATE;dmig自动备份表,down可回退general_ci

deploy/migrations/m0022_pipeline_conversations_collation.json

@@ -0,0 +1,11 @@
+{
+  "id": "m0022",
+  "title": "pipeline_conversations 归籍 pipeline-service + collation 统一 unicode_ci（消灭代码里的 COLLATE 补丁依赖）",
+  "backup_tables": ["pipeline_conversations"],
+  "up": [
+    {"op": "sql", "sql": "ALTER TABLE pipeline_conversations CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci"}
+  ],
+  "down": [
+    {"op": "sql", "sql": "ALTER TABLE pipeline_conversations CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci"}
+  ]
+}