diff --git a/Sensor/adr_sensor/parsers/opencode_parser.py b/Sensor/adr_sensor/parsers/opencode_parser.py
index c5e838ae..fdfadc22 100644
--- a/Sensor/adr_sensor/parsers/opencode_parser.py
+++ b/Sensor/adr_sensor/parsers/opencode_parser.py
@@ -155,12 +155,17 @@ def _find_db_file(base: Path) -> Optional[Path]:
         candidates = OpencodeParser._find_db_files(base)
         return candidates[0] if candidates else None
 
+    @staticmethod
+    def _read_only_uri(db_path: Path) -> str:
+        """Build a read-only SQLite URI, percent-encoding characters such as '#', '?' and '%'."""
+        return f"{Path(db_path).resolve().as_uri()}?mode=ro"
+
     @staticmethod
     def _has_session_schema(db_path: Path) -> bool:
         """Return True if the database has opencode's session tables."""
         conn = None
         try:
-            conn = sqlite3.connect(f"file:{db_path}?mode=ro", uri=True)
+            conn = sqlite3.connect(OpencodeParser._read_only_uri(db_path), uri=True)
             rows = conn.execute("SELECT name FROM sqlite_master WHERE type = 'table'").fetchall()
         except (sqlite3.Error, OSError):
             return False
@@ -224,7 +229,7 @@ def _parse_sqlite(self, db_path: Path) -> List[AgentEvent]:
         conn = None
         try:
             # Open read-only so we never disturb a live opencode process.
-            conn = sqlite3.connect(f"file:{db_path}?mode=ro", uri=True)
+            conn = sqlite3.connect(OpencodeParser._read_only_uri(db_path), uri=True)
             conn.row_factory = sqlite3.Row
 
             sessions = self._get_sqlite_sessions(conn)
diff --git a/Sensor/tests/test_parsers.py b/Sensor/tests/test_parsers.py
index ffeb2fd2..9d161848 100644
--- a/Sensor/tests/test_parsers.py
+++ b/Sensor/tests/test_parsers.py
@@ -2309,6 +2309,32 @@ def test_session_database_error_is_logged_as_a_warning(self, tmp_path, capsys):
         assert "[OPENCODE] Error processing session ses_locked: database is locked" in captured.err
         assert "Error processing session" not in captured.out
 
+    @pytest.mark.parametrize("dirname", ["data#1", "100%data", "what?"])
+    def test_reads_database_under_path_with_uri_special_characters(self, tmp_path, dirname):
+        base = tmp_path / dirname
+        base.mkdir()
+        _build_opencode_db(
+            base / "opencode.db",
+            sessions=[{"id": "ses_uri"}],
+            messages=[{"id": "msg_uri", "session_id": "ses_uri", "data": {"role": "user"}}],
+            parts=[
+                {
+                    "id": "prt_uri",
+                    "message_id": "msg_uri",
+                    "session_id": "ses_uri",
+                    "data": {"type": "text", "text": "hello from a special path"},
+                }
+            ],
+        )
+
+        parser = _make_opencode_parser(base)
+        entries = parser.parse_all()
+
+        assert parser.backend == "sqlite"
+        assert [entry.session_id for entry in entries] == ["opencode_uri"]
+        # A '#' must not truncate the path and create a stray database file.
+        assert sorted(path.name for path in tmp_path.iterdir()) == [dirname]
+
     def test_unreadable_database_still_records_database_error(self, tmp_path):
         db_path = tmp_path / "opencode.db"
         db_path.write_bytes(b"not a sqlite database" * 10)