refactor(backend): refactor project, add database migrations support

backend/Dockerfile

@@ -4,4 +4,4 @@ COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 COPY . .
 EXPOSE 8000
-CMD ["uvicorn", "app.app:app", "--host", "0.0.0.0", "--port", "8000"]
+CMD alembic upgrade head && uvicorn app.app:app --host 0.0.0.0 --port 8000

backend/README.md

@@ -0,0 +1,24 @@
+# Backend – automatické migrace (Alembic)
+
+## Automatické migrace
+
+Při spuštění backendu v Dockeru se automaticky provedou migrace databáze pomocí Alembic (`alembic upgrade head`).
+
+## Ruční práce s migracemi
+
+- Vytvoření nové migrace podle modelů:
+  ```sh
+  export DATABASE_URL='mysql+asyncmy://root:strongpassword@localhost:3306/group_project'
+  alembic revision --autogenerate -m "popis migrace"
+  ```
+- Aplikace migrací:
+  ```sh
+  export DATABASE_URL='mysql+asyncmy://root:strongpassword@localhost:3306/group_project'
+  alembic upgrade head
+  ```
+
+## Poznámky
+- Pro autogeneraci migrací je nutné mít nainstalován balíček `pymysql`.
+- Modely pro migrace jsou v `app/db.py`.
+- Konfigurace Alembic je v `alembic.ini` a `alembic/env.py`.
+

backend/alembic.ini

@@ -0,0 +1,148 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts.
+# this is typically a path given in POSIX (e.g. forward slashes)
+# format, relative to the token %(here)s which refers to the location of this
+# ini file
+script_location = %(here)s/alembic
+
+# template used to generate migration file names; The default value is %%(rev)s_%%(slug)s
+# Uncomment the line below if you want the files to be prepended with date and time
+# see https://alembic.sqlalchemy.org/en/latest/tutorial.html#editing-the-ini-file
+# for all available tokens
+# file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(rev)s_%%(slug)s
+
+# sys.path path, will be prepended to sys.path if present.
+# defaults to the current working directory.  for multiple paths, the path separator
+# is defined by "path_separator" below.
+prepend_sys_path = .
+
+
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+# If specified, requires the python>=3.9 or backports.zoneinfo library and tzdata library.
+# Any required deps can installed by adding `alembic[tz]` to the pip requirements
+# string value is passed to ZoneInfo()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; This defaults
+# to <script_location>/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path.
+# The path separator used here should be the separator specified by "path_separator"
+# below.
+# version_locations = %(here)s/bar:%(here)s/bat:%(here)s/alembic/versions
+
+# path_separator; This indicates what character is used to split lists of file
+# paths, including version_locations and prepend_sys_path within configparser
+# files such as alembic.ini.
+# The default rendered in new alembic.ini files is "os", which uses os.pathsep
+# to provide os-dependent path splitting.
+#
+# Note that in order to support legacy alembic.ini files, this default does NOT
+# take place if path_separator is not present in alembic.ini.  If this
+# option is omitted entirely, fallback logic is as follows:
+#
+# 1. Parsing of the version_locations option falls back to using the legacy
+#    "version_path_separator" key, which if absent then falls back to the legacy
+#    behavior of splitting on spaces and/or commas.
+# 2. Parsing of the prepend_sys_path option falls back to the legacy
+#    behavior of splitting on spaces, commas, or colons.
+#
+# Valid values for path_separator are:
+#
+# path_separator = :
+# path_separator = ;
+# path_separator = space
+# path_separator = newline
+#
+# Use os.pathsep. Default configuration used for new projects.
+path_separator = os
+
+# set to 'true' to search source files recursively
+# in each "version_locations" directory
+# new in Alembic version 1.10
+# recursive_version_locations = false
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+# database URL.  This is consumed by the user-maintained env.py script only.
+# other means of configuring database URLs may be customized within the env.py
+# file.
+# sqlalchemy.url = driver://user:pass@localhost/dbname
+# Pro async MariaDB bude url brána z proměnné prostředí DATABASE_URL
+
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks = black
+# black.type = console_scripts
+# black.entrypoint = black
+# black.options = -l 79 REVISION_SCRIPT_FILENAME
+
+# lint with attempts to fix using "ruff" - use the module runner, against the "ruff" module
+# hooks = ruff
+# ruff.type = module
+# ruff.module = ruff
+# ruff.options = check --fix REVISION_SCRIPT_FILENAME
+
+# Alternatively, use the exec runner to execute a binary found on your PATH
+# hooks = ruff
+# ruff.type = exec
+# ruff.executable = ruff
+# ruff.options = check --fix REVISION_SCRIPT_FILENAME
+
+# Logging configuration.  This is also consumed by the user-maintained
+# env.py script only.
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARNING
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARNING
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

backend/alembic/README

@@ -0,0 +1 @@
+Generic single-database configuration.

backend/alembic/env.py

@@ -0,0 +1,56 @@
+import os
+import sys
+from logging.config import fileConfig
+from sqlalchemy import pool, create_engine
+from alembic import context
+
+# Přidání backend do sys.path pro správný import
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
+from app.core.db import Base
+
+config = context.config
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+
+DATABASE_URL = os.getenv("DATABASE_URL")
+if not DATABASE_URL:
+    # fallback na synchronní url pro Alembic (používá sync driver)
+    mariadb_host = os.getenv("MARIADB_HOST", "localhost")
+    mariadb_port = os.getenv("MARIADB_PORT", "3306")
+    mariadb_db = os.getenv("MARIADB_DB", "group_project")
+    mariadb_user = os.getenv("MARIADB_USER", "root")
+    mariadb_password = os.getenv("MARIADB_PASSWORD", "strongpassword")
+    DATABASE_URL = f"mysql+pymysql://{mariadb_user}:{mariadb_password}@{mariadb_host}:{mariadb_port}/{mariadb_db}"
+
+# Vždy používej synchronní engine pro migrace
+SYNC_DATABASE_URL = DATABASE_URL.replace("+asyncmy", "+pymysql")
+
+
+def run_migrations_offline() -> None:
+    context.configure(
+        url=SYNC_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:
+    connectable = create_engine(SYNC_DATABASE_URL, poolclass=pool.NullPool)
+    with connectable.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()

backend/alembic/script.py.mako

@@ -0,0 +1,28 @@
+"""${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, Sequence[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:
+    """Upgrade schema."""
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    ${downgrades if downgrades else "pass"}

backend/alembic/versions/81f275275556_init_migration.py

@@ -0,0 +1,52 @@
+"""Init migration
+
+Revision ID: 81f275275556
+Revises: 
+Create Date: 2025-09-24 17:39:25.346690
+
+"""
+from typing import Sequence, Union
+
+import fastapi_users_db_sqlalchemy
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '81f275275556'
+down_revision: Union[str, Sequence[str], None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('transaction',
+    sa.Column('id', sa.Integer(), autoincrement=True, nullable=False),
+    sa.Column('amount', sa.Float(), nullable=False),
+    sa.Column('description', sa.String(length=255), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_table('user',
+    sa.Column('first_name', sa.String(length=100), nullable=True),
+    sa.Column('last_name', sa.String(length=100), nullable=True),
+    sa.Column('id', fastapi_users_db_sqlalchemy.generics.GUID(), nullable=False),
+    sa.Column('email', sa.String(length=320), nullable=False),
+    sa.Column('hashed_password', sa.String(length=1024), nullable=False),
+    sa.Column('is_active', sa.Boolean(), nullable=False),
+    sa.Column('is_superuser', sa.Boolean(), nullable=False),
+    sa.Column('is_verified', sa.Boolean(), nullable=False),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_user_email'), 'user', ['email'], unique=True)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_user_email'), table_name='user')
+    op.drop_table('user')
+    op.drop_table('transaction')
+    # ### end Alembic commands ###

backend/app/app.py

@@ -1,9 +1,10 @@
 from fastapi import Depends, FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
-from .db import User, create_db_and_tables
+from app.models.user import User
-from .schemas import UserCreate, UserRead, UserUpdate
+
-from .users import auth_backend, current_active_verified_user, fastapi_users
+from app.schemas.user import UserCreate, UserRead, UserUpdate
+from app.services.user_service import auth_backend, current_active_verified_user, fastapi_users
 
 app = FastAPI()
 
@@ -53,9 +54,3 @@ async def root():
 @app.get("/authenticated-route")
 async def authenticated_route(user: User = Depends(current_active_verified_user)):
     return {"message": f"Hello {user.email}!"}
-
-
-@app.on_event("startup")
-async def on_startup():
-    # Not needed if you setup a migration system like Alembic
-    await create_db_and_tables()

backend/app/core/.keep

@@ -0,0 +1,2 @@
+# Konfigurace a utility
+

backend/app/core/base.py

@@ -0,0 +1,4 @@
+from sqlalchemy.ext.declarative import DeclarativeMeta, declarative_base
+
+Base: DeclarativeMeta = declarative_base()
+

backend/app/core/db.py

@@ -1,10 +1,6 @@
 import os
-from typing import AsyncGenerator
+from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker
-
+from app.core.base import Base  # Import Base z nového souboru
-from fastapi import Depends
-from fastapi_users.db import SQLAlchemyBaseUserTableUUID, SQLAlchemyUserDatabase
-from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
-from sqlalchemy.ext.declarative import DeclarativeMeta, declarative_base
 
 DATABASE_URL = os.getenv("DATABASE_URL")
 if not DATABASE_URL:
@@ -13,21 +9,20 @@ if not DATABASE_URL:
     mariadb_db = os.getenv("MARIADB_DB", "group_project")
     mariadb_user = os.getenv("MARIADB_USER", "root")
     mariadb_password = os.getenv("MARIADB_PASSWORD", "strongpassword")
-    #always use SSL except for localhost - i dont want to include certs
     if mariadb_host and mariadb_db and mariadb_user and mariadb_password:
-        # Use MariaDB/MySQL over async driver
         DATABASE_URL = f"mysql+asyncmy://{mariadb_user}:{mariadb_password}@{mariadb_host}:{mariadb_port}/{mariadb_db}"
     else:
         raise Exception("Only MariaDB is supported. Please set the DATABASE_URL environment variable.")
 
-Base: DeclarativeMeta = declarative_base()
+# Explicitní import všech modelů, aby byly registrovány v Base.metadata
+from app.models.user import User
+from app.models.transaction import Transaction
 
+from app.models.user import User
 
-class User(SQLAlchemyBaseUserTableUUID, Base):
+# Pokud máš další modely, importuj je zde:
-    pass
+# from app.models.other_model import OtherModel
 
-
-# Nastavení connect_args pro SSL pouze pokud není localhost
 ssl_enabled = os.getenv("MARIADB_HOST", "localhost") != "localhost"
 connect_args = {"ssl": {"ssl": True}} if ssl_enabled else {}
 
@@ -38,17 +33,3 @@ engine = create_async_engine(
     connect_args=connect_args,
 )
 async_session_maker = async_sessionmaker(engine, expire_on_commit=False)
-
-
-async def create_db_and_tables():
-    async with engine.begin() as conn:
-        await conn.run_sync(Base.metadata.create_all)
-
-
-async def get_async_session() -> AsyncGenerator[AsyncSession, None]:
-    async with async_session_maker() as session:
-        yield session
-
-
-async def get_user_db(session: AsyncSession = Depends(get_async_session)):
-    yield SQLAlchemyUserDatabase(session, User)

backend/app/core/queue.py

@@ -1,7 +1,6 @@
 import json
 import os
 from typing import Any, Dict
-
 import asyncio
 
 RABBITMQ_URL = os.getenv("RABBITMQ_URL") or (
@@ -12,11 +11,8 @@ RABBITMQ_URL = os.getenv("RABBITMQ_URL") or (
 )
 QUEUE_NAME = os.getenv("MAIL_QUEUE", "mail_queue")
 
-
 async def _publish_async(message: Dict[str, Any]) -> None:
-    # Import locally to avoid hard dependency at import-time
     import aio_pika
-
     connection = await aio_pika.connect_robust(RABBITMQ_URL)
     try:
         channel = await connection.channel()
@@ -29,19 +25,12 @@ async def _publish_async(message: Dict[str, Any]) -> None:
     finally:
         await connection.close()
 
-
 def enqueue_email(to: str, subject: str, body: str) -> None:
-    """
-    Enqueue an email to RabbitMQ. If RabbitMQ or aio_pika is not available,
-    this function will raise ImportError/ConnectionError. The caller may
-    implement fallback (e.g., direct send).
-    """
     message = {"type": "email", "to": to, "subject": subject, "body": body}
-
     try:
         loop = asyncio.get_running_loop()
-        # Fire-and-forget task so we don't block the request path
         loop.create_task(_publish_async(message))
     except RuntimeError:
-        # No running loop (e.g., called from sync context) – run a short loop
         asyncio.run(_publish_async(message))
+# ...existing code...
+

backend/app/models/.keep

@@ -0,0 +1,2 @@
+# SQLAlchemy modely
+

backend/app/models/transaction.py

@@ -0,0 +1,9 @@
+from sqlalchemy import Column, Integer, String, Float
+from ..core.db import Base
+
+class Transaction(Base):
+    __tablename__ = "transaction"
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    amount = Column(Float, nullable=False)
+    description = Column(String(length=255), nullable=True)
+

backend/app/models/user.py

@@ -0,0 +1,7 @@
+from sqlalchemy import Column, String
+from fastapi_users.db import SQLAlchemyBaseUserTableUUID
+from ..core.base import Base  # Import Base z base.py
+
+class User(SQLAlchemyBaseUserTableUUID, Base):
+    first_name = Column(String(length=100), nullable=True)
+    last_name = Column(String(length=100), nullable=True)

backend/app/schemas.py

@@ -1,15 +0,0 @@
-import uuid
-
-from fastapi_users import schemas
-
-
-class UserRead(schemas.BaseUser[uuid.UUID]):
-    pass
-
-
-class UserCreate(schemas.BaseUserCreate):
-    pass
-
-
-class UserUpdate(schemas.BaseUserUpdate):
-    pass

backend/app/schemas/.keep

@@ -0,0 +1,2 @@
+# Pydantic schémata
+

backend/app/schemas/user.py

@@ -0,0 +1,16 @@
+import uuid
+from typing import Optional
+from fastapi_users import schemas
+
+class UserRead(schemas.BaseUser[uuid.UUID]):
+    first_name: Optional[str] = None
+    surname: Optional[str] = None
+
+class UserCreate(schemas.BaseUserCreate):
+    first_name: Optional[str] = None
+    surname: Optional[str] = None
+
+class UserUpdate(schemas.BaseUserUpdate):
+    first_name: Optional[str] = None
+    surname: Optional[str] = None
+

backend/app/services/.keep

@@ -0,0 +1,2 @@
+# Business logika
+

backend/app/services/db.py

@@ -0,0 +1,14 @@
+from typing import AsyncGenerator
+from fastapi import Depends
+from sqlalchemy.ext.asyncio import AsyncSession
+from fastapi_users.db import SQLAlchemyUserDatabase
+
+from ..core.db import async_session_maker
+from ..models.user import User
+
+async def get_async_session() -> AsyncGenerator[AsyncSession, None]:
+    async with async_session_maker() as session:
+        yield session
+
+async def get_user_db(session: AsyncSession = Depends(get_async_session)):
+    yield SQLAlchemyUserDatabase(session, User)

backend/app/services/user_service.py

@@ -11,19 +11,19 @@ from fastapi_users.authentication import (
 )
 from fastapi_users.db import SQLAlchemyUserDatabase
 
-from .db import User, get_user_db
+from ..models.user import User
+from ..services.db import get_user_db
+from ..core.queue import enqueue_email
 
 SECRET = os.getenv("SECRET", "CHANGE_ME_SECRET")
 FRONTEND_URL = os.getenv("FRONTEND_URL", "http://localhost:5173")
 BACKEND_URL = os.getenv("BACKEND_URL", "http://localhost:8000")
 
-
 class UserManager(UUIDIDMixin, BaseUserManager[User, uuid.UUID]):
     reset_password_token_secret = SECRET
     verification_token_secret = SECRET
 
     async def on_after_register(self, user: User, request: Optional[Request] = None):
-        # Ask FastAPI Users to generate a verification token and trigger the hook below
         await self.request_verify(user, request)
 
     async def on_after_forgot_password(
@@ -34,7 +34,6 @@ class UserManager(UUIDIDMixin, BaseUserManager[User, uuid.UUID]):
     async def on_after_request_verify(
             self, user: User, token: str, request: Optional[Request] = None
     ):
-        # Build verification email and send through RabbitMQ (with direct SMTP fallback)
         verify_frontend_link = f"{FRONTEND_URL}/verify?token={token}"
         verify_backend_link = f"{BACKEND_URL}/auth/verify?token={token}"
         subject = "Ověření účtu"
@@ -47,26 +46,20 @@ class UserManager(UUIDIDMixin, BaseUserManager[User, uuid.UUID]):
             "Pokud jsi registraci neprováděl(a), tento email ignoruj.\n"
         )
         try:
-            from .queue import enqueue_email
             enqueue_email(to=user.email, subject=subject, body=body)
         except Exception:
-            # Fallback: if queue is unavailable, log the email content (dev fallback)
             print("[Email Fallback] To:", user.email)
             print("[Email Fallback] Subject:", subject)
             print("[Email Fallback] Body:\n", body)
 
-
 async def get_user_manager(user_db: SQLAlchemyUserDatabase = Depends(get_user_db)):
     yield UserManager(user_db)
 
-
 bearer_transport = BearerTransport(tokenUrl="auth/jwt/login")
 
-
 def get_jwt_strategy() -> JWTStrategy:
     return JWTStrategy(secret=SECRET, lifetime_seconds=3600)
 
-
 auth_backend = AuthenticationBackend(
     name="jwt",
     transport=bearer_transport,
@@ -77,3 +70,4 @@ fastapi_users = FastAPIUsers[User, uuid.UUID](get_user_manager, [auth_backend])
 
 current_active_user = fastapi_users.current_user(active=True)
 current_active_verified_user = fastapi_users.current_user(active=True, verified=True)
+

backend/app/workers/.keep

@@ -0,0 +1,2 @@
+# Background worker
+

backend/requirements.txt

@@ -1,11 +1,12 @@
 aio-pika==9.5.6
 aiormq==6.8.1
 aiosqlite==0.21.0
+alembic
 annotated-types==0.7.0
 anyio==4.11.0
 argon2-cffi==23.1.0
 argon2-cffi-bindings==25.1.0
-asyncmy==0.2.9
+asyncmy
 bcrypt==4.3.0
 cffi==2.0.0
 click==8.1.8
@@ -42,3 +43,4 @@ uvloop==0.21.0
 watchfiles==1.1.0
 websockets==15.0.1
 yarl==1.20.1
+pymysql

backend/worker/email_worker.py

@@ -3,7 +3,6 @@ import json
 import os
 from typing import Any, Dict
 
-
 RABBITMQ_URL = os.getenv("RABBITMQ_URL") or (
     f"amqp://{os.getenv('RABBITMQ_USERNAME', 'user')}:"
     f"{os.getenv('RABBITMQ_PASSWORD', 'bitnami123')}@"

create_migration.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+if [ -z "$1" ]; then
+  echo "Usage: $0 <migration_message>"
+  exit 1
+fi
+
+cd backend || { echo "Directory 'backend' does not exist"; exit 1; }
+alembic revision --autogenerate -m "$1"
+git add alembic/versions/*
+cd - || exit

upgrade_database.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+# Script to upgrade the database using Alembic
+
+cd backend || { echo "Directory 'backend' does not exist"; exit 1; }
+alembic upgrade head
+