Add new deps, writen a db engine, docker-compose and .env-example

backend/app/models/posts.py

@@ -0,0 +1,15 @@
+from sqlalchemy import Column, Integer, String, ForeignKey, DateTime
+from sqlalchemy.orm import relationship
+
+from app.db_engine import Base
+
+
+class Post(Base):
+    __tablename__ = "posts"
+
+    id = Column(Integer, primary_key=True, index=True, autoincrement=True, nullable=False)
+    title = Column(String, index=True, nullable=False)
+    content = Column(String, index=True, nullable=False)
+    images = Column(String, index=True)
+    updated_at = Column(DateTime, index=True)
+