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

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))