chore: clear the lint in the files this branch touches

Unused imports, duplicated import lines, and bare excepts that swallowed
KeyboardInterrupt along with everything else.

backend/migrations/versions/2026-08-15_add_book_matching_keys_and_duplicate__4358e7d4743a.py

@@ -7,7 +7,6 @@ Create Date: 2026-08-15 15:09:02.708914
 """
 
 import warnings
-from typing import TYPE_CHECKING
 
 import sqlalchemy as sa
 from alembic import op
@@ -18,9 +17,6 @@ from advanced_alchemy.types.password_hash.passlib import PasslibHasher
 from advanced_alchemy.types.password_hash.pwdlib import PwdlibHasher
 from sqlalchemy import Text  # noqa: F401
 
-if TYPE_CHECKING:
-    from collections.abc import Sequence
-
 __all__ = ["downgrade", "upgrade", "schema_upgrades", "schema_downgrades", "data_upgrades", "data_downgrades"]
 
 sa.GUID = GUID

backend/migrations/versions/2026-08-15_canonicalize_author_names_49a9e85a0ffc.py

@@ -7,7 +7,6 @@ Create Date: 2026-08-15 15:59:47.331545
 """
 
 import warnings
-from typing import TYPE_CHECKING
 
 import sqlalchemy as sa
 from alembic import op
@@ -18,9 +17,6 @@ from advanced_alchemy.types.password_hash.passlib import PasslibHasher
 from advanced_alchemy.types.password_hash.pwdlib import PwdlibHasher
 from sqlalchemy import Text  # noqa: F401
 
-if TYPE_CHECKING:
-    from collections.abc import Sequence
-
 __all__ = ["downgrade", "upgrade", "schema_upgrades", "schema_downgrades", "data_upgrades", "data_downgrades"]
 
 sa.GUID = GUID

backend/migrations/versions/2026-08-15_recompute_book_matching_keys_ed41acf21270.py

@@ -7,7 +7,6 @@ Create Date: 2026-08-15 15:44:28.341020
 """
 
 import warnings
-from typing import TYPE_CHECKING
 
 import sqlalchemy as sa
 from alembic import op
@@ -18,9 +17,6 @@ from advanced_alchemy.types.password_hash.passlib import PasslibHasher
 from advanced_alchemy.types.password_hash.pwdlib import PwdlibHasher
 from sqlalchemy import Text  # noqa: F401
 
-if TYPE_CHECKING:
-    from collections.abc import Sequence
-
 __all__ = ["downgrade", "upgrade", "schema_upgrades", "schema_downgrades", "data_upgrades", "data_downgrades"]
 
 sa.GUID = GUID

backend/src/chitai/database/models/book.py

@@ -3,12 +3,9 @@ from typing import TYPE_CHECKING, Any, Optional
 
 from sqlalchemy import Index, ForeignKey, UniqueConstraint
 from sqlalchemy.orm import Mapped, mapped_column, relationship, validates
-from sqlalchemy.orm import mapped_column
-from sqlalchemy.orm import relationship
 from sqlalchemy.ext.orderinglist import ordering_list
 from sqlalchemy.ext.associationproxy import association_proxy
 from sqlalchemy.ext.associationproxy import AssociationProxy
-from sqlalchemy.orm.collections import attribute_keyed_dict
 
 from advanced_alchemy.base import BigIntAuditBase, BigIntBase
 

backend/src/chitai/services/metadata_extractor.py

@@ -3,7 +3,6 @@
 # TODO: Code is a mess. Clean it up and add docstrings
 
 # Standard library
-from abc import ABC, abstractmethod
 import datetime
 from pathlib import Path
 from io import BytesIO
@@ -405,7 +404,7 @@ class PdfExtractor(FileExtractor):
         try:
             return datetime.datetime.strptime(date_portion, "%Y%m%d").date()
 
-        except Exception as e:
+        except Exception:
             return None
 
     @classmethod
@@ -557,7 +556,7 @@ class EpubExtractor(FileExtractor):
         try:
             return epub.get_metadata("DC", "description")[0][0]
 
-        except:
+        except Exception:
             return None
 
     @classmethod
@@ -566,7 +565,7 @@ class EpubExtractor(FileExtractor):
             date_str = epub.get_metadata("DC", "date")[0][0].split("T")[0]
             return datetime.date.fromisoformat(date_str)
 
-        except:
+        except Exception:
             return None
 
     @classmethod
@@ -574,7 +573,7 @@ class EpubExtractor(FileExtractor):
         try:
             epub.get_metadata("DC", "publisher")[0][0]
 
-        except:
+        except Exception:
             return None
 
     @classmethod
@@ -598,7 +597,7 @@ class EpubExtractor(FileExtractor):
                             cover_item = epub.get_item_with_id(cover_id)
                             if cover_item:
                                 return PIL.Image.open(BytesIO(cover_item.content))
-        except Exception as e:
+        except Exception:
             pass  # Fallback to next strategy
 
         # Strategy 2: Search image filenames for "cover" keyword

backend/src/chitai/services/utils.py

@@ -7,10 +7,7 @@ import errno
 import hashlib
 from pathlib import Path
 import shutil
-from typing import TYPE_CHECKING, BinaryIO
-
-if TYPE_CHECKING:
-    from hashlib import _Hash
+from typing import BinaryIO
 
 # Third-party libraries
 import PIL
@@ -487,7 +484,7 @@ def is_valid_isbn(isbn: str) -> bool:
             return is_valid_isbn13(isbn)
         else:
             return False
-    except:
+    except Exception:
         return False
 
 

backend/tests/unit/test_matching.py

@@ -61,7 +61,6 @@ class TestNormalizeTitle:
         assert normalize_title(title) == title.casefold()
 
 
-
 class TestNormalizeAuthor:
     """One person, written down several ways."""