new fixes

app/core/models/content_v3.py

@@ -28,7 +28,7 @@ class EncryptedContent(AlchemyBase):
     preview_conf = Column(JSON, nullable=False, default=dict)
 
     # Crypto parameters (fixed per network)
-    aead_scheme = Column(String(32), nullable=False, default='AES_GCM_SIV')
+    aead_scheme = Column(String(32), nullable=False, default='AES_GCM')
     chunk_bytes = Column(Integer, nullable=False, default=1048576)
     salt_b64 = Column(String(64), nullable=True)  # per-content salt used for nonce derivation