Enhance Telegram bot with database integration and API features

- Added SQLite database support with Alembic for migrations.
- Implemented FastAPI for HTTP API to manage duties.
- Updated configuration to include database URL and HTTP port.
- Created entrypoint script for Docker to handle migrations and permissions.
- Expanded command handlers to register users and display duties.
- Developed a web application for calendar display of duties.
- Included necessary Pydantic schemas and SQLAlchemy models for data handling.
- Updated requirements.txt to include new dependencies for FastAPI and SQLAlchemy.

alembic/env.py

@@ -0,0 +1,50 @@
+"""Alembic env: use config DATABASE_URL and db.models.Base."""
+import os
+import sys
+from logging.config import fileConfig
+
+from dotenv import load_dotenv
+from sqlalchemy import create_engine
+from alembic import context
+
+load_dotenv()
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from db.models import Base
+
+config = context.config
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+database_url = os.getenv("DATABASE_URL", "sqlite:///data/duty_teller.db")
+config.set_main_option("sqlalchemy.url", database_url)
+
+target_metadata = Base.metadata
+
+connect_args = {"check_same_thread": False} if "sqlite" in database_url else {}
+
+
+def run_migrations_offline() -> None:
+    context.configure(
+        url=database_url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    engine = create_engine(database_url, connect_args=connect_args)
+    with engine.connect() as connection:
+        context.configure(connection=connection, target_metadata=target_metadata)
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

alembic/script.py.mako

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

alembic/versions/001_initial_users_and_duties.py

@@ -0,0 +1,44 @@
+"""Initial users and duties tables
+
+Revision ID: 001
+Revises:
+Create Date: 2025-02-17
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = "001"
+down_revision: Union[str, None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "users",
+        sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
+        sa.Column("telegram_user_id", sa.BigInteger(), nullable=False),
+        sa.Column("full_name", sa.Text(), nullable=False),
+        sa.Column("username", sa.Text(), nullable=True),
+        sa.Column("first_name", sa.Text(), nullable=True),
+        sa.Column("last_name", sa.Text(), nullable=True),
+        sa.PrimaryKeyConstraint("id"),
+        sa.UniqueConstraint("telegram_user_id"),
+    )
+    op.create_table(
+        "duties",
+        sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
+        sa.Column("user_id", sa.Integer(), nullable=False),
+        sa.Column("start_at", sa.Text(), nullable=False),
+        sa.Column("end_at", sa.Text(), nullable=False),
+        sa.ForeignKeyConstraint(["user_id"], ["users.id"], ),
+        sa.PrimaryKeyConstraint("id"),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("duties")
+    op.drop_table("users")