moving styling and views to be more consistent and for gallery view to be less cumbersome.

app/models.py

@@ -23,7 +23,7 @@ class ImageRecord(db.Model):
     filepath = db.Column(db.String(512), nullable=False)
     thumb_path = db.Column(db.String(512))
     hash = db.Column(db.String(64), unique=True, nullable=False)  # SHA256
-    perceptual_hash = db.Column(db.String(16), nullable=True)  # hex of 64-bit hash
+    perceptual_hash = db.Column(db.String(64), nullable=True)  # hex of 256-bit hash
     file_size = db.Column(db.Integer, nullable=True)
     width = db.Column(db.Integer, nullable=True)
     height = db.Column(db.Integer, nullable=True)
@@ -64,3 +64,15 @@ class ArchiveRecord(db.Model):
     artist = db.Column(db.String(255), nullable=True)
     tag_id = db.Column(db.Integer, db.ForeignKey("tag.id", ondelete="SET NULL"), nullable=True)
     tag = db.relationship("Tag")
+
+
+class AppSettings(db.Model):
+    """
+    Key-value store for application settings and version tracking.
+    Used to persist configuration and trigger data migrations on version changes.
+    """
+    __tablename__ = "app_settings"
+    id = db.Column(db.Integer, primary_key=True)
+    key = db.Column(db.String(64), unique=True, nullable=False)
+    value = db.Column(db.Text, nullable=True)
+    updated_at = db.Column(db.DateTime, default=db.func.now(), onupdate=db.func.now())