🏗️ Código fonte completo: PostgreSQL, nutrição, receita, score labels, PWA fixes

backend/app/models/product.py

@@ -14,4 +14,4 @@ class Product(Base):
     nova_group = Column(Integer)
     nutrition_json = Column(Text)  # JSON string
     image_url = Column(String)
-    updated_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+    updated_at = Column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc))

backend/app/models/scan.py

@@ -12,4 +12,4 @@ class Scan(Base):
     score = Column(Integer)
     summary = Column(Text)
     analysis_json = Column(Text)  # Full AI analysis as JSON
-    scanned_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+    scanned_at = Column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc))

backend/app/models/user.py

@@ -9,4 +9,4 @@ class User(Base):
     name = Column(String, nullable=False)
     password_hash = Column(String, nullable=False)
     is_premium = Column(Boolean, default=False)
-    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc))