Desynth page and improved item info api. Added string substitution to utils.

backend/app/models.py

@@ -15,10 +15,21 @@ class Inventory(Base):
     character_name = Column(String)
     storage_type = Column(String)
     item_name = Column(String)
+    item_id = Column(Integer, nullable=True)
     quantity = Column(Integer)
     last_updated = Column(DateTime, default=datetime.utcnow)
 
 
+class ItemIcon(Base):
+    __tablename__ = "item_icons"
+
+    id = Column(Integer, primary_key=True)
+    category = Column(String, nullable=False)
+    image_data = Column(String, nullable=False)
+    image_format = Column(String, nullable=True)
+    image_encoding = Column(String, nullable=True)
+
+
 class Spell(Base):
     """Spell table with job level columns (selected jobs only)."""