fix: use FindDataRoot in FindOrInitSQLiteStore for consistent database location

src/store/graph_store_sqlite.go

@@ -74,31 +74,20 @@ func FindAndOpenSQLiteStore() (GraphStore, error) {
 }
 
 // FindOrInitSQLiteStore is like FindAndOpenSQLiteStore but intended for server
-// mode: if no .ax.db is found it creates and initialises one in the current
-// working directory instead of returning an error.
+// mode: if no database is found it creates and initialises one in the
+// ~/.local/share/ax/ directory instead of returning an error.
 func FindOrInitSQLiteStore() (GraphStore, error) {
-	dir, err := filepath.Abs(".")
+	dataRoot, err := FindDataRoot(".local", "share")
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("failed to find data dir: %w", err)
 	}
-	for {
-		dbpath := filepath.Join(dir, ".ax.db")
-		if _, err := os.Stat(dbpath); err == nil {
-			return NewSQLiteStore(dbpath)
-		}
-		if parent := filepath.Dir(dir); parent == dir {
-			break
-		} else {
-			dir = parent
+	dbPath := filepath.Join(dataRoot, "ax.db")
+	if _, err := os.Stat(dbPath); err != nil {
+		if err := InitSQLiteStore(dbPath); err != nil {
+			return nil, err
 		}
 	}
-	// Not found — create and initialise in CWD.
-	cwd, _ := filepath.Abs(".")
-	dbpath := filepath.Join(cwd, ".ax.db")
-	if err := InitSQLiteStore(dbpath); err != nil {
-		return nil, err
-	}
-	return NewSQLiteStore(dbpath)
+	return NewSQLiteStore(dbPath)
 }
 
 // NewSQLiteStore opens a SQLite database at the given path, runs a one-time