feat(messages): add MessageAttachment model

database.py

@@ -31,7 +31,7 @@ from enum import IntEnum
 from sqlalchemy import create_engine, Column, Integer, SmallInteger, String, Text, Boolean, DateTime, ForeignKey, Table, Numeric, Date, Time, TypeDecorator, UniqueConstraint, Enum
 from sqlalchemy.dialects.postgresql import ARRAY as PG_ARRAY, JSONB as PG_JSONB
 from sqlalchemy.ext.declarative import declarative_base
-from sqlalchemy.orm import sessionmaker, relationship
+from sqlalchemy.orm import sessionmaker, relationship, backref
 from flask_login import UserMixin
 
 
@@ -2287,6 +2287,21 @@ class PrivateMessage(Base):
     parent = relationship('PrivateMessage', remote_side=[id])
 
 
+class MessageAttachment(Base):
+    """Załączniki do wiadomości prywatnych"""
+    __tablename__ = 'message_attachments'
+
+    id = Column(Integer, primary_key=True)
+    message_id = Column(Integer, ForeignKey('private_messages.id', ondelete='CASCADE'), nullable=False)
+    filename = Column(String(255), nullable=False)         # original filename
+    stored_filename = Column(String(255), nullable=False)   # UUID-based on disk
+    file_size = Column(Integer, nullable=False)             # bytes
+    mime_type = Column(String(100), nullable=False)
+    created_at = Column(DateTime, default=datetime.now)
+
+    message = relationship('PrivateMessage', backref=backref('attachments', cascade='all, delete-orphan'))
+
+
 # ============================================================
 # B2B CLASSIFIEDS
 # ============================================================