feat: create backend skeleton

backend/src/utils/db/models.py

@@ -0,0 +1,50 @@
+from datetime import datetime
+from typing import Any
+
+from sqlalchemy import BigInteger, Column, DateTime, func
+from sqlalchemy.dialects.postgresql import JSONB
+from sqlmodel import Field, SQLModel
+
+
+class Account(SQLModel, table=True):
+    __tablename__ = "accounts"
+
+    account_id: int | None = Field(default=None, primary_key=True)
+    tg_user_id: int | None = Field(
+        default=None, sa_column=Column(BigInteger, unique=True)
+    )
+    label: str | None = None
+    phone: str | None = None
+    session_name: str
+    is_active: bool = True
+    raw: dict[str, Any] = Field(
+        default_factory=dict, sa_column=Column(JSONB, nullable=False)
+    )
+    created_at: datetime = Field(
+        sa_column=Column(
+            DateTime(timezone=True), nullable=False, server_default=func.now()
+        )
+    )
+    updated_at: datetime = Field(
+        sa_column=Column(
+            DateTime(timezone=True),
+            nullable=False,
+            server_default=func.now(),
+            onupdate=func.now(),
+        )
+    )
+
+
+class Message(SQLModel, table=True):
+    __tablename__ = "messages"
+
+    account_id: int = Field(primary_key=True)
+    chat_id: int = Field(sa_column=Column(BigInteger, primary_key=True))
+    message_id: int = Field(sa_column=Column(BigInteger, primary_key=True))
+    date: datetime = Field(sa_column=Column(DateTime(timezone=True), primary_key=True))
+    raw: dict[str, Any] = Field(
+        default_factory=dict, sa_column=Column(JSONB, nullable=False)
+    )
+    deleted_at: datetime | None = Field(
+        default=None, sa_column=Column(DateTime(timezone=True))
+    )