diff --git a/deploy/migrations/m0018_sd_projects_type_default_general.json b/deploy/migrations/m0018_sd_projects_type_default_general.json
new file mode 100644
index 0000000..c7227e8
--- /dev/null
+++ b/deploy/migrations/m0018_sd_projects_type_default_general.json
@@ -0,0 +1,21 @@
+{
+  "id": "m0018",
+  "title": "sd_projects.project_type 默认值去 SDLC 语义(web_app→general)：sd_projects 是全产线共用的项目容器表(bidding/opportunity/sdlc 都在建项目)，列默认值 web_app 导致非开发产线项目被标成 Web应用(实测 opportunity_general 2个项目 project_type=web_app 语义错)；同步把存量非 sdlc 项目的 web_app 归正为 general。models JSON 已同步改 default='general' 并补 directory_name/default_model 两列定义(此前只存在于 m0001 手工迁移，models 从未定义→新机部署建出的表缺列→workspace.py 裸查 directory_name 必崩 Unknown column)",
+  "backup_tables": ["sd_projects"],
+  "up": [
+    {
+      "op": "sql",
+      "sql": "ALTER TABLE sd_projects MODIFY COLUMN project_type VARCHAR(50) NOT NULL DEFAULT 'general' COMMENT '项目类型(general通用/bidding投标/web_app等SDLC类型)'"
+    },
+    {
+      "op": "sql",
+      "sql": "UPDATE sd_projects SET project_type='general' WHERE project_type='web_app' AND (pipeline_id IS NULL OR pipeline_id NOT LIKE 'sdlc%')"
+    }
+  ],
+  "down": [
+    {
+      "op": "sql",
+      "sql": "ALTER TABLE sd_projects MODIFY COLUMN project_type VARCHAR(50) NOT NULL DEFAULT 'web_app' COMMENT '项目类型'"
+    }
+  ]
+}