ticket01修正补充: opp_id 放宽为可空仅在列仍 NOT NULL 时执行（幂等，避免共享库每次启动重复 ALTER）

crm-opportunity/src/main/java/com/crm/opportunity/config/SchemeCardOwnerMigrationRunner.java

@@ -69,10 +69,13 @@ public class SchemeCardOwnerMigrationRunner implements CommandLineRunner {
                 log.info("[scheme-card-owner-migration] 存量方案卡回填商机归属 {} 行", backfilled);
                 // 放宽旧列为可空：实体已不映射 opp_id，新插卡不带该列——NOT NULL 会让 A3 新建卡
                 // 首次 INSERT 即失败（真实环境实测）。旧行值保留供审计，新行 NULL。
+                // 仅在列仍 NOT NULL 时执行（幂等：已放宽的库启动零 DDL，避免共享库反复 ALTER）
+                if (!columnNullable(conn, TABLE, "opp_id")) {
                     jdbcTemplate.execute("ALTER TABLE " + TABLE + " MODIFY COLUMN opp_id bigint NULL"
                             + " COMMENT '（已废弃·owner 化解耦遗留）历史所属商机ID，新行恒 NULL'");
                     log.info("[scheme-card-owner-migration] 旧列 opp_id 已放宽为可空");
                 }
+            }
 
             if (!indexExists(conn, TABLE, "uk_osc_owner_customer")) {
                 dropIndexIfPresent(conn, "uk_osc_opp_customer");
@@ -99,6 +102,13 @@ public class SchemeCardOwnerMigrationRunner implements CommandLineRunner {
         }
     }
 
+    private boolean columnNullable(Connection conn, String table, String column) throws SQLException {
+        DatabaseMetaData meta = conn.getMetaData();
+        try (ResultSet rs = meta.getColumns(null, null, table, column)) {
+            return rs.next() && "YES".equalsIgnoreCase(rs.getString("IS_NULLABLE"));
+        }
+    }
+
     private boolean indexExists(Connection conn, String table, String indexName) throws SQLException {
         DatabaseMetaData meta = conn.getMetaData();
         try (ResultSet rs = meta.getIndexInfo(null, null, table, false, false)) {