feat: create backend skeleton

backend/migrations/env.py

@@ -0,0 +1,50 @@
+import asyncio
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy.ext.asyncio import create_async_engine
+from sqlmodel import SQLModel
+
+from utils.db import models  # noqa: F401
+from utils.env import env
+
+config = context.config
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = SQLModel.metadata
+
+
+def _async_url() -> str:
+    return env.db.connection_url.replace("postgresql://", "postgresql+asyncpg://", 1)
+
+
+def run_migrations_offline() -> None:
+    context.configure(
+        url=_async_url(),
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def _do_run_migrations(connection) -> None:  # noqa: ANN001
+    context.configure(connection=connection, target_metadata=target_metadata)
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_migrations_online() -> None:
+    connectable = create_async_engine(_async_url())
+    async with connectable.connect() as connection:
+        await connection.run_sync(_do_run_migrations)
+    await connectable.dispose()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    asyncio.run(run_migrations_online())

backend/migrations/init/01-timescaledb.sql

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+CREATE EXTENSION IF NOT EXISTS timescaledb;

backend/migrations/script.py.mako

@@ -0,0 +1,26 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from collections.abc import Sequence
+
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel
+${imports if imports else ""}
+
+revision: str = ${repr(up_revision)}
+down_revision: str | None = ${repr(down_revision)}
+branch_labels: str | Sequence[str] | None = ${repr(branch_labels)}
+depends_on: str | Sequence[str] | None = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

backend/migrations/versions/77df960a31de_initial_accounts_and_messages_hypertable.py

@@ -0,0 +1,75 @@
+"""initial accounts and messages hypertable
+
+Revision ID: 77df960a31de
+Revises:
+Create Date: 2026-05-29 10:58:16.118857
+
+"""
+
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy.dialects import postgresql
+
+revision: str = "77df960a31de"
+down_revision: str | None = None
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table(
+        "accounts",
+        sa.Column("account_id", sa.Integer(), nullable=False),
+        sa.Column("tg_user_id", sa.BigInteger(), nullable=True),
+        sa.Column("label", sa.String(), nullable=True),
+        sa.Column("phone", sa.String(), nullable=True),
+        sa.Column("session_name", sa.String(), nullable=False),
+        sa.Column("is_active", sa.Boolean(), nullable=False),
+        sa.Column("raw", postgresql.JSONB(astext_type=sa.Text()), nullable=False),
+        sa.Column(
+            "created_at",
+            sa.DateTime(timezone=True),
+            server_default=sa.text("now()"),
+            nullable=False,
+        ),
+        sa.Column(
+            "updated_at",
+            sa.DateTime(timezone=True),
+            server_default=sa.text("now()"),
+            nullable=False,
+        ),
+        sa.PrimaryKeyConstraint("account_id"),
+        sa.UniqueConstraint("tg_user_id"),
+    )
+    op.create_table(
+        "messages",
+        sa.Column("account_id", sa.Integer(), nullable=False),
+        sa.Column("chat_id", sa.BigInteger(), nullable=False),
+        sa.Column("message_id", sa.BigInteger(), nullable=False),
+        sa.Column("date", sa.DateTime(timezone=True), nullable=False),
+        sa.Column("raw", postgresql.JSONB(astext_type=sa.Text()), nullable=False),
+        sa.Column("deleted_at", sa.DateTime(timezone=True), nullable=True),
+        sa.PrimaryKeyConstraint("account_id", "chat_id", "message_id", "date"),
+    )
+    # ### end Alembic commands ###
+
+    op.execute(
+        "SELECT create_hypertable('messages', by_range('date', INTERVAL '1 month'))"
+    )
+    op.execute(
+        "ALTER TABLE messages SET ("
+        "timescaledb.enable_columnstore = true, "
+        "timescaledb.segmentby = 'chat_id', "
+        "timescaledb.orderby = 'date DESC')"
+    )
+    op.execute("CALL add_columnstore_policy('messages', after => INTERVAL '30 days')")
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table("messages")
+    op.drop_table("accounts")
+    # ### end Alembic commands ###