refactor: update timestamp handling to use timezone-aware datetime

app/models/sound.py

@@ -3,11 +3,13 @@
 from datetime import datetime
 from enum import Enum
 from typing import Optional
+from zoneinfo import ZoneInfo
 
-from app.database import db
 from sqlalchemy import Boolean, DateTime, Integer, String
 from sqlalchemy.orm import Mapped, mapped_column
 
+from app.database import db
+
 
 class SoundType(Enum):
     """Sound type enumeration."""
@@ -75,13 +77,13 @@ class Sound(db.Model):
     # Timestamps
     created_at: Mapped[datetime] = mapped_column(
         DateTime,
-        default=datetime.utcnow,
+        default=lambda: datetime.now(tz=ZoneInfo("UTC")),
         nullable=False,
     )
     updated_at: Mapped[datetime] = mapped_column(
         DateTime,
-        default=datetime.utcnow,
-        onupdate=datetime.utcnow,
+        default=lambda: datetime.now(tz=ZoneInfo("UTC")),
+        onupdate=lambda: datetime.now(tz=ZoneInfo("UTC")),
         nullable=False,
     )
 
@@ -114,7 +116,7 @@ class Sound(db.Model):
     def increment_play_count(self) -> None:
         """Increment the play count for this sound."""
         self.play_count += 1
-        self.updated_at = datetime.utcnow()
+        self.updated_at = datetime.now(tz=ZoneInfo("UTC"))
         db.session.commit()
 
     def set_normalized_info(
@@ -130,7 +132,7 @@ class Sound(db.Model):
         self.normalized_size = normalized_size
         self.normalized_hash = normalized_hash
         self.is_normalized = True
-        self.updated_at = datetime.utcnow()
+        self.updated_at = datetime.now(tz=ZoneInfo("UTC"))
 
     def clear_normalized_info(self) -> None:
         """Clear normalized sound information."""
@@ -139,7 +141,7 @@ class Sound(db.Model):
         self.normalized_hash = None
         self.normalized_size = None
         self.is_normalized = False
-        self.updated_at = datetime.utcnow()
+        self.updated_at = datetime.now(tz=ZoneInfo("UTC"))
 
     def update_file_info(
         self,
@@ -153,7 +155,7 @@ class Sound(db.Model):
         self.duration = duration
         self.size = size
         self.hash = hash_value
-        self.updated_at = datetime.utcnow()
+        self.updated_at = datetime.now(tz=ZoneInfo("UTC"))
 
     @classmethod
     def find_by_hash(cls, hash_value: str) -> Optional["Sound"]: