refactor: integrate Alembic, restructure project, and clean up

- Add Alembic configuration (alembic.ini, env.py) for database migrations
- Remove legacy wheel.db and unnecessary __pycache__ files
- Delete models.py to separate SQLAlchemy and Pydantic concerns
- Restructure main.py to use modular API routers (user/admin)
- Introduce config backend for centralized settings management

backend/.config

@@ -0,0 +1,40 @@
+import sys
+from os.path import abspath, dirname
+import logging.config
+from alembic import context
+
+sys.path.insert(0, dirname(dirname(abspath(__file__))))
+
+from config import DATABASE_URL, LOGGING_CONFIG
+from database import Base, engine
+import models  
+
+#log-settings
+
+logging.config.dictConfig(LOGGING_CONFIG)
+
+target_metadata = Base.metadata
+
+def run_migrations_offline():
+    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():
+    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()

backend/alembic.ini

@@ -0,0 +1,149 @@
+# 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 = 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
+# Or organize into date-based subdirectories (requires recursive_version_locations = true)
+# file_template = %%(year)d/%%(month).2d/%%(day).2d_%%(hour).2d%%(minute).2d_%%(second).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 tzdata library which can be 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 = sqlite:///./wheel.db
+
+
+[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 +1,80 @@
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+from database import Base, engine
+import models
+target_metadata = Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        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/api/admin

@@ -0,0 +1,37 @@
+from fastapi import FastAPI, Depends, HTTPException
+from sqlalchemy.orm import Session
+from fastapi.middleware.cors import CORSMiddleware
+
+import models
+import schemas
+import crud
+
+from database import SessionLocal, engine
+
+models.Base.metadata.create_all(bind=engine)
+
+app = FastAPI()
+
+# DELETE ITEM
+@app.delete("/items/{item_id}")
+def delete_item(
+    item_id: int,
+    db: Session = Depends(get_db)
+):
+    item = crud.delete_item(db, item_id)
+
+    if not item:
+        raise HTTPException(
+            status_code=404,
+            detail="Item not found"
+        )
+
+    return {"message": "Item deleted"}
+
+    # CREATE ITEM
+@app.post("/items", response_model=schemas.ItemResponse)
+def create_item(
+    item: schemas.ItemCreate,
+    db: Session = Depends(get_db)
+):
+    return crud.create_item(db, item.title)

backend/api/user

@@ -0,0 +1,38 @@
+from fastapi import FastAPI, Depends, HTTPException
+from sqlalchemy.orm import Session
+from fastapi.middleware.cors import CORSMiddleware
+
+import models
+import schemas
+import crud
+
+from database import SessionLocal, engine
+
+models.Base.metadata.create_all(bind=engine)
+
+app = FastAPI()
+
+
+# SPIN
+@app.post("/spin")
+def spin(db: Session = Depends(get_db)):
+
+    winner = crud.spin_wheel(db)
+
+    if not winner:
+        raise HTTPException(
+            status_code=400,
+            detail="No items available"
+        )
+
+    return {
+        "winner": {
+            "id": winner.id,
+            "title": winner.title
+        }
+    }
+
+   # GET ITEMS
+@app.get("/items", response_model=list[schemas.ItemResponse])
+def get_items(db: Session = Depends(get_db)):
+    return crud.get_items(db) 

backend/app/db/model.py

@@ -0,0 +1,87 @@
+from fastapi import FastAPI, Depends, HTTPException
+from sqlalchemy.orm import Session
+from fastapi.middleware.cors import CORSMiddleware
+
+import models
+import schemas
+import crud
+
+from database import SessionLocal, engine
+
+models.Base.metadata.create_all(bind=engine)
+
+app = FastAPI()
+
+# CORS
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Database Session
+def get_db():
+    db = SessionLocal()
+
+    try:
+        yield db
+    finally:
+        db.close()
+
+# GET ITEMS
+@app.get("/items", response_model=list[schemas.ItemResponse])
+def get_items(db: Session = Depends(get_db)):
+    return crud.get_items(db)
+
+# CREATE ITEM
+@app.post("/items", response_model=schemas.ItemResponse)
+def create_item(
+    item: schemas.ItemCreate,
+    db: Session = Depends(get_db)
+):
+    return crud.create_item(db, item.title)
+
+# DELETE ITEM
+@app.delete("/items/{item_id}")
+def delete_item(
+    item_id: int,
+    db: Session = Depends(get_db)
+):
+    item = crud.delete_item(db, item_id)
+
+    if not item:
+        raise HTTPException(
+            status_code=404,
+            detail="Item not found"
+        )
+
+    return {"message": "Item deleted"}
+
+# SPIN
+@app.post("/spin")
+def spin(db: Session = Depends(get_db)):
+
+    winner = crud.spin_wheel(db)
+
+    if not winner:
+        raise HTTPException(
+            status_code=400,
+            detail="No items available"
+        )
+
+    return {
+        "winner": {
+            "id": winner.id,
+            "title": winner.title
+        }
+    }
+
+    from sqlalchemy import Column, Integer, String
+from database import Base
+
+class Item(Base):
+    __tablename__ = "items"
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String, nullable=False)

backend/app/db/session.py

@@ -15,4 +15,13 @@ SessionLocal = sessionmaker(
     bind=engine
 )
 
+# Database Session
+def get_db():
+    db = SessionLocal()
+
+    try:
+        yield db
+    finally:
+        db.close()
+        
 Base = declarative_base()

backend/main.py

@@ -21,59 +21,7 @@ app.add_middleware(
     allow_headers=["*"],
 )
 
-# Database Session
-def get_db():
-    db = SessionLocal()
 
-    try:
-        yield db
-    finally:
-        db.close()
 
-# GET ITEMS
+app.include_router(user_router)
-@app.get("/items", response_model=list[schemas.ItemResponse])
+app.include_router(admin_router)
-def get_items(db: Session = Depends(get_db)):
-    return crud.get_items(db)
-
-# CREATE ITEM
-@app.post("/items", response_model=schemas.ItemResponse)
-def create_item(
-    item: schemas.ItemCreate,
-    db: Session = Depends(get_db)
-):
-    return crud.create_item(db, item.title)
-
-# DELETE ITEM
-@app.delete("/items/{item_id}")
-def delete_item(
-    item_id: int,
-    db: Session = Depends(get_db)
-):
-    item = crud.delete_item(db, item_id)
-
-    if not item:
-        raise HTTPException(
-            status_code=404,
-            detail="Item not found"
-        )
-
-    return {"message": "Item deleted"}
-
-# SPIN
-@app.post("/spin")
-def spin(db: Session = Depends(get_db)):
-
-    winner = crud.spin_wheel(db)
-
-    if not winner:
-        raise HTTPException(
-            status_code=400,
-            detail="No items available"
-        )
-
-    return {
-        "winner": {
-            "id": winner.id,
-            "title": winner.title
-        }
-    }

backend/models.py

@@ -1,8 +0,0 @@
-from sqlalchemy import Column, Integer, String
-from database import Base
-
-class Item(Base):
-    __tablename__ = "items"
-
-    id = Column(Integer, primary_key=True, index=True)
-    title = Column(String, nullable=False)