fix ADR migration test fixture and backup guidance

Author: ngallodev

docs/upstream-sync/adr-recovery.md

@@ -12,7 +12,9 @@ continue using the graph database.
 
 Reindexing or replacing the graph database leaves the sidecar file untouched.
 Back up and restore the graph database and its `.adr.db` sidecar together to
-preserve ADRs. Team artifacts retain the existing interchange format: export
+preserve ADRs. Stop writers and close the stores before copying the files, or
+use SQLite's backup facilities for each database while coordinating writes.
+Team artifacts retain the existing interchange format: export
 copies the selected ADR into `project_summaries` in the snapshot, and import
 restores it into the sidecar only if that project has no local ADR. A failed
 artifact ADR restore is logged; graph import remains successful, so recover the

tests/test_artifact.c

@@ -281,12 +281,9 @@ TEST(adr_sidecar_migrates_and_survives_graph_replacement) {
     sqlite3 *raw = NULL;
     ASSERT_EQ(sqlite3_open(g_db, &raw), SQLITE_OK);
     ASSERT_EQ(
-        sqlite3_exec(
-            raw,
-            "CREATE TABLE project_summaries (project TEXT PRIMARY KEY, summary TEXT NOT NULL, "
-            "source_hash TEXT NOT NULL, created_at TEXT NOT NULL, updated_at TEXT NOT NULL);"
-            "INSERT INTO project_summaries VALUES ('test-proj','legacy ADR','h','c','u');",
-            NULL, NULL, NULL),
+        sqlite3_exec(raw,
+                     "INSERT INTO project_summaries VALUES ('test-proj','legacy ADR','h','c','u');",
+                     NULL, NULL, NULL),
         SQLITE_OK);
     sqlite3_close(raw);