refactor: merge cyclicly imported files into library.py

pyproject.toml

@@ -85,7 +85,11 @@ ignore_errors = true
 qt_api = "pyside6"
 
 [tool.pyright]
-ignore = ["src/tagstudio/qt/helpers/vendored/pydub/", ".venv/**"]
+ignore = [
+    ".venv/**",
+    "src/tagstudio/core/library/json/",
+    "src/tagstudio/qt/helpers/vendored/pydub/",
+]
 include = ["src/tagstudio", "tests"]
 reportAny = false
 reportIgnoreCommentWithoutRule = false

src/tagstudio/core/library/alchemy/constants.py

@@ -23,3 +23,14 @@
 )
 SELECT * FROM ChildTags;
 """)
+
+TAG_CHILDREN_ID_QUERY = text("""
+WITH RECURSIVE ChildTags AS (
+    SELECT :tag_id AS tag_id
+    UNION
+    SELECT tp.child_id AS tag_id
+    FROM tag_parents tp
+    INNER JOIN ChildTags c ON tp.parent_id = c.tag_id
+)
+SELECT tag_id FROM ChildTags;
+""")

src/tagstudio/core/library/alchemy/db.py

@@ -4,6 +4,7 @@
 
 
 from pathlib import Path
+from typing import override
 
 import structlog
 from sqlalchemy import Dialect, Engine, String, TypeDecorator, create_engine, text
@@ -19,12 +20,14 @@ class PathType(TypeDecorator):
     impl = String
     cache_ok = True
 
-    def process_bind_param(self, value: Path, dialect: Dialect):
+    @override
+    def process_bind_param(self, value: Path | None, dialect: Dialect):
         if value is not None:
             return Path(value).as_posix()
         return None
 
-    def process_result_value(self, value: str, dialect: Dialect):
+    @override
+    def process_result_value(self, value: str | None, dialect: Dialect):
         if value is not None:
             return Path(value)
         return None