diff --git a/scripts/commands/graph_schema.py b/scripts/commands/graph_schema.py
index 7b25140..fcc000e 100644
--- a/scripts/commands/graph_schema.py
+++ b/scripts/commands/graph_schema.py
@@ -16,6 +16,7 @@
 from typing import Any, Dict, Optional
 
 from commands import register_command
+from utils import default_db_path as _default_db_path
 
 
 def add_args(parser):
@@ -26,11 +27,6 @@ def add_args(parser):
                         help="Custom path for SQLite database file")
 
 
-def _default_db_path(workspace: str) -> str:
-    """Return the default SQLite db path for a workspace."""
-    return os.path.join(workspace, ".codelens", "codelens.db")
-
-
 def get_graph_schema(workspace: str, db_path: Optional[str] = None) -> Dict[str, Any]:
     """Return the shape of the graph (node/edge counts + type distribution).
 
diff --git a/scripts/graph_model.py b/scripts/graph_model.py
index 2a5667c..ce7af13 100644
--- a/scripts/graph_model.py
+++ b/scripts/graph_model.py
@@ -50,7 +50,7 @@
 from collections import deque
 from typing import Any, Dict, Iterable, List, Optional, Set, Tuple
 
-from utils import logger
+from utils import default_db_path as _default_db_path, logger
 
 
 # ─── Schema Constants ─────────────────────────────────────────
@@ -158,11 +158,6 @@ def init_graph_schema(conn: sqlite3.Connection) -> None:
 
 # ─── Population ───────────────────────────────────────────────
 
-def _default_db_path(workspace: str) -> str:
-    """Return the default SQLite db path for a workspace."""
-    return os.path.join(workspace, ".codelens", "codelens.db")
-
-
 def _parse_file_line_from_node_id(node_id: str) -> Tuple[str, int]:
     """Extract (file, line) from a flat-registry node id like 'path/file.py:42:fn_name'.
 
diff --git a/scripts/persistent_registry.py b/scripts/persistent_registry.py
index ca16557..0493532 100644
--- a/scripts/persistent_registry.py
+++ b/scripts/persistent_registry.py
@@ -27,13 +27,12 @@
 from datetime import datetime, timezone
 from typing import Any, Dict, List, Optional, Set, Tuple
 
-from utils import logger
+from utils import default_db_path, logger
 
 
 # ─── Schema Version ────────────────────────────────────────────
 
 SCHEMA_VERSION = 1
-DB_FILENAME = "codelens.db"
 
 # ─── SQL Statements ────────────────────────────────────────────
 
@@ -129,9 +128,7 @@ def __init__(self, workspace: str, db_path: Optional[str] = None):
                      Defaults to .codelens/codelens.db
         """
         self.workspace = workspace
-        self._db_path = db_path or os.path.join(
-            workspace, ".codelens", DB_FILENAME
-        )
+        self._db_path = db_path or default_db_path(workspace)
         self._local = threading.local()  # Thread-local storage for connections
         self._initialized = False
         self._init_lock = threading.Lock()
@@ -855,7 +852,7 @@ def vacuum(self) -> None:
 
 def db_exists(workspace: str, db_path: Optional[str] = None) -> bool:
     """Check if a CodeLens SQLite database exists for the workspace."""
-    path = db_path or os.path.join(workspace, ".codelens", DB_FILENAME)
+    path = db_path or default_db_path(workspace)
     return os.path.exists(path)
 
 
diff --git a/scripts/utils.py b/scripts/utils.py
index dbfc524..4ec8d66 100644
--- a/scripts/utils.py
+++ b/scripts/utils.py
@@ -26,6 +26,15 @@ def get_logger(name: str = "codelens") -> logging.Logger:
 
 # ─── Shared Configuration ───────────────────────────────────
 
+DB_FILENAME = "codelens.db"
+
+
+def default_db_path(workspace: str) -> str:
+    """Return the default SQLite database path for the workspace."""
+    safe_workspace = os.path.abspath(workspace)
+    return os.path.join(safe_workspace, ".codelens", DB_FILENAME)
+
+
 DEFAULT_IGNORE_DIRS = frozenset({
     'node_modules', '.git', 'dist', 'build', 'target',
     '__pycache__', '.codelens', '.next', '.nuxt', '.cache',
diff --git a/tests/test_graph_model.py b/tests/test_graph_model.py
index eb5fc30..4f9f1e9 100644
--- a/tests/test_graph_model.py
+++ b/tests/test_graph_model.py
@@ -71,6 +71,29 @@ def scanned_clean_app():
     shutil.rmtree(workspace, ignore_errors=True)
 
 
+# ─── 0. Default DB Path ───────────────────────────────────────
+
+
+class TestDefaultDbPath:
+    """All call sites must resolve the same default SQLite path."""
+
+    def test_default_db_path_consistent_across_modules(self, tmp_path):
+        workspace = str(tmp_path / "codelens-workspace")
+
+        from utils import default_db_path
+        from graph_model import _default_db_path
+        from commands.graph_schema import _default_db_path as schema_default_db_path
+        from persistent_registry import PersistentRegistry, db_exists
+
+        expected = default_db_path(workspace)
+        assert _default_db_path(workspace) == expected
+        assert schema_default_db_path(workspace) == expected
+
+        registry = PersistentRegistry(workspace)
+        assert registry.db_path == expected
+        assert db_exists(workspace) == os.path.exists(expected)
+
+
 # ─── 1. Schema Initialization ────────────────────────────────