fix(data): baseline 迁移 search_path 改为事务级作用域，修复 sqlx 迁移表访问问题

crates/aether-data/migrations/20260403000000_baseline.sql

@@ -28,7 +28,7 @@ SET client_encoding = 'UTF8';
 
 SET standard_conforming_strings = on;
 
-SELECT pg_catalog.set_config('search_path', '', false);
+SELECT pg_catalog.set_config('search_path', '', true);
 
 SET check_function_bodies = false;
 
@@ -4585,4 +4585,3 @@ END $mig$;
 -- PostgreSQL database dump complete
 --
 
-

crates/aether-data/src/migrate.rs

@@ -162,3 +162,29 @@ fn validate_applied_migrations(
 
     Ok(())
 }
+
+#[cfg(test)]
+mod tests {
+    use super::MIGRATOR;
+
+    #[test]
+    fn baseline_migration_keeps_empty_search_path_transaction_local() {
+        let baseline = MIGRATOR
+            .iter()
+            .find(|migration| migration.version == 20260403000000)
+            .expect("baseline migration should be embedded");
+
+        assert!(
+            baseline
+                .sql
+                .contains("SELECT pg_catalog.set_config('search_path', '', true);"),
+            "baseline migration must keep empty search_path transaction-local so sqlx bookkeeping can still access _sqlx_migrations",
+        );
+        assert!(
+            !baseline
+                .sql
+                .contains("SELECT pg_catalog.set_config('search_path', '', false);"),
+            "baseline migration must not persist an empty search_path at session scope",
+        );
+    }
+}