feat: implement GraphQL member management API

Implement complete member management system with GraphQL API per OpenSpec proposal.
Only firstName is required; all other fields are optional with conditional validation.

Key features:
- GraphQL CRUD operations (create, read, update, delete members)
- SQLAlchemy 2.0 async with SQLite database
- Alembic database migrations
- Conditional validation (email/phone validated only when provided)
- Member fields: firstName (required), lastName, address, email, phone (all optional)
- Database seed script with sample member
- FastAPI with Strawberry GraphQL integration

Implementation details:
- Python 3.11+ with uv package manager
- Async database sessions throughout
- Proper error handling and validation
- Code quality: black, isort, ruff
- Comprehensive end-to-end testing completed

All 20 tasks from OpenSpec proposal completed successfully.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.env.example

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+# Database Configuration
+DATABASE_URL=sqlite+aiosqlite:///./clubber.db
+
+# Debug Mode
+DEBUG=False

.gitignore

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+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+*.egg-info/
+dist/
+build/
+
+# Virtual environments
+.venv/
+venv/
+ENV/
+
+# Database
+*.db
+*.db-shm
+*.db-wal
+
+# Environment variables
+.env
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db

.python-version

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+3.13

alembic.ini

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+# 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/migrations
+
+# 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 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 = driver://user:pass@localhost/dbname
+# (URL configured programmatically in env.py from src.config)
+
+
+[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

migrations/README

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+Generic single-database configuration.

migrations/env.py

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+import asyncio
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy import pool
+from sqlalchemy.engine import Connection
+from sqlalchemy.ext.asyncio import async_engine_from_config
+
+# Import config to get database URL
+from src.config import settings
+
+# Import our Base and models
+from src.database import Base
+from src.models import member  # noqa: F401 - import to register models
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Set the database URL from our settings
+config.set_main_option("sqlalchemy.url", settings.database_url)
+
+# 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)
+
+# Set target_metadata to our Base metadata for autogenerate support
+target_metadata = Base.metadata
+
+
+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 do_run_migrations(connection: Connection) -> None:
+    """Helper function to run migrations with a connection."""
+    context.configure(connection=connection, target_metadata=target_metadata)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_async_migrations() -> None:
+    """Run migrations in 'online' mode with async support."""
+    connectable = async_engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    async with connectable.connect() as connection:
+        await connection.run_sync(do_run_migrations)
+
+    await connectable.dispose()
+
+
+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.
+
+    """
+    asyncio.run(run_async_migrations())
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

migrations/script.py.mako

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+"""${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"}

migrations/versions/0f79356844b5_create_members_table.py

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+"""create members table
+
+Revision ID: 0f79356844b5
+Revises:
+Create Date: 2025-11-20 11:39:25.900143
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "0f79356844b5"
+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(
+        "members",
+        sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
+        sa.Column("first_name", sa.String(length=100), nullable=False),
+        sa.Column("last_name", sa.String(length=100), nullable=True),
+        sa.Column("street", sa.String(length=200), nullable=True),
+        sa.Column("apartment_number", sa.String(length=20), nullable=True),
+        sa.Column("zip", sa.String(length=20), nullable=True),
+        sa.Column("city", sa.String(length=100), nullable=True),
+        sa.Column("country", sa.String(length=100), nullable=True),
+        sa.Column("email", sa.String(length=255), nullable=True),
+        sa.Column("phone", sa.String(length=50), nullable=True),
+        sa.Column(
+            "created_at",
+            sa.DateTime(),
+            server_default=sa.text("(CURRENT_TIMESTAMP)"),
+            nullable=False,
+        ),
+        sa.Column(
+            "updated_at",
+            sa.DateTime(),
+            server_default=sa.text("(CURRENT_TIMESTAMP)"),
+            nullable=False,
+        ),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table("members")
+    # ### end Alembic commands ###

pyproject.toml

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+[project]
+name = "clubber"
+version = "0.1.0"
+description = "Member management system for non-profit societies with GraphQL API"
+requires-python = ">=3.11"
+authors = [
+    { name = "Clubber Team" }
+]
+license = { text = "MIT" }
+dependencies = [
+    "aiosqlite>=0.21.0",
+    "alembic>=1.17.2",
+    "fastapi>=0.121.3",
+    "pydantic-settings>=2.12.0",
+    "sqlalchemy[asyncio]>=2.0.44",
+    "strawberry-graphql[fastapi]>=0.286.0",
+    "uvicorn[standard]>=0.38.0",
+]
+
+[dependency-groups]
+dev = [
+    "black>=25.11.0",
+    "isort>=7.0.0",
+    "pytest>=9.0.1",
+    "pytest-asyncio>=1.3.0",
+    "ruff>=0.14.5",
+]
+
+[tool.black]
+line-length = 88
+target-version = ["py311"]
+
+[tool.ruff]
+line-length = 88
+
+[tool.ruff.lint]
+select = ["E", "F", "W", "I"]
+ignore = ["E501"]
+
+[tool.isort]
+profile = "black"
+multi_line_output = 3
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"

scripts/seed.py

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+#!/usr/bin/env python
+"""Seed database with sample member data."""
+import asyncio
+
+from sqlalchemy import select
+
+from src.database import async_session_maker
+from src.models.member import Member
+
+
+async def seed_database():
+    """Create sample member if it doesn't exist."""
+    async with async_session_maker() as session:
+        # Check if sample member already exists
+        result = await session.execute(
+            select(Member).where(Member.email == "jane.doe@example.com")
+        )
+        existing_member = result.scalar_one_or_none()
+
+        if existing_member:
+            print("✓ Sample member already exists")
+            print(f"  ID: {existing_member.id}")
+            print(f"  Name: {existing_member.first_name} {existing_member.last_name}")
+            print(f"  Email: {existing_member.email}")
+            return
+
+        # Create sample member with minimal required data
+        # Demonstrates that only firstName is required
+        sample_member = Member(
+            first_name="Jane",
+            last_name="Doe",
+            email="jane.doe@example.com",
+            # All other fields (street, zip, city, country, phone) are None
+        )
+
+        session.add(sample_member)
+        await session.commit()
+        await session.refresh(sample_member)
+
+        print("✓ Sample member created successfully!")
+        print(f"  ID: {sample_member.id}")
+        print(f"  Name: {sample_member.first_name} {sample_member.last_name}")
+        print(f"  Email: {sample_member.email}")
+        print(f"  Created at: {sample_member.created_at}")
+
+
+if __name__ == "__main__":
+    print("Seeding database...")
+    asyncio.run(seed_database())
+    print("Done!")

src/config.py

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+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    """Application settings with environment variable support."""
+
+    database_url: str = "sqlite+aiosqlite:///./clubber.db"
+    debug: bool = False
+
+    model_config = SettingsConfigDict(env_file=".env", extra="ignore")
+
+
+settings = Settings()

src/database.py

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+from typing import AsyncGenerator
+
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+from sqlalchemy.orm import DeclarativeBase
+
+from src.config import settings
+
+# Create async engine
+async_engine = create_async_engine(
+    settings.database_url,
+    echo=settings.debug,
+    future=True,
+)
+
+# Create async session factory
+async_session_maker = async_sessionmaker(
+    async_engine,
+    class_=AsyncSession,
+    expire_on_commit=False,
+)
+
+
+# Declarative base for models
+class Base(DeclarativeBase):
+    pass
+
+
+# Dependency for FastAPI
+async def get_db_session() -> AsyncGenerator[AsyncSession, None]:
+    """Provide database session for FastAPI dependency injection."""
+    async with async_session_maker() as session:
+        try:
+            yield session
+            await session.commit()
+        except Exception:
+            await session.rollback()
+            raise
+        finally:
+            await session.close()

src/main.py

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+import strawberry
+from fastapi import FastAPI
+from strawberry.fastapi import GraphQLRouter
+
+from src.resolvers.member import Mutation, Query
+
+# Create Strawberry schema
+schema = strawberry.Schema(query=Query, mutation=Mutation)
+
+# Create GraphQL router
+graphql_app = GraphQLRouter(schema)
+
+# Create FastAPI app
+app = FastAPI(
+    title="Clubber API",
+    description="Member management system for non-profit societies",
+    version="0.1.0",
+)
+
+# Mount GraphQL endpoint
+app.include_router(graphql_app, prefix="/graphql")
+
+
+@app.get("/")
+async def root():
+    """Root endpoint with API information."""
+    return {
+        "message": "Clubber API",
+        "graphql_endpoint": "/graphql",
+        "docs": "/docs",
+    }

src/models/__init__.py

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+from src.models.member import Member
+
+__all__ = ["Member"]

src/models/member.py

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+from datetime import datetime
+from typing import Optional
+
+from sqlalchemy import String, func
+from sqlalchemy.orm import Mapped, mapped_column
+
+from src.database import Base
+
+
+class Member(Base):
+    """Member model for club/society management."""
+
+    __tablename__ = "members"
+
+    # Primary key
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+
+    # Required field
+    first_name: Mapped[str] = mapped_column(String(100), nullable=False)
+
+    # Optional fields
+    last_name: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)
+    street: Mapped[Optional[str]] = mapped_column(String(200), nullable=True)
+    apartment_number: Mapped[Optional[str]] = mapped_column(String(20), nullable=True)
+    zip: Mapped[Optional[str]] = mapped_column(String(20), nullable=True)
+    city: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)
+    country: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)
+    email: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
+    phone: Mapped[Optional[str]] = mapped_column(String(50), nullable=True)
+
+    # Timestamps
+    created_at: Mapped[datetime] = mapped_column(
+        default=func.now(), server_default=func.now(), nullable=False
+    )
+    updated_at: Mapped[datetime] = mapped_column(
+        default=func.now(),
+        server_default=func.now(),
+        onupdate=func.now(),
+        nullable=False,
+    )
+
+    def __repr__(self) -> str:
+        return f"<Member(id={self.id}, first_name='{self.first_name}', last_name='{self.last_name}')>"

src/resolvers/member.py

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+from typing import List, Optional
+
+import strawberry
+from sqlalchemy import select
+
+from src.database import async_session_maker
+from src.models.member import Member as MemberModel
+from src.schemas.member import CreateMemberInput, Member, UpdateMemberInput
+from src.validation import validate_email, validate_first_name, validate_phone
+
+
+class MemberNotFoundError(Exception):
+    """Raised when a member is not found."""
+
+    pass
+
+
+@strawberry.type
+class Query:
+    @strawberry.field
+    async def member(self, id: int) -> Optional[Member]:
+        """Get a single member by ID."""
+        async with async_session_maker() as session:
+            result = await session.execute(
+                select(MemberModel).where(MemberModel.id == id)
+            )
+            db_member = result.scalar_one_or_none()
+
+            if db_member is None:
+                return None
+
+            return Member(
+                id=db_member.id,
+                first_name=db_member.first_name,
+                last_name=db_member.last_name,
+                street=db_member.street,
+                apartment_number=db_member.apartment_number,
+                zip=db_member.zip,
+                city=db_member.city,
+                country=db_member.country,
+                email=db_member.email,
+                phone=db_member.phone,
+                created_at=db_member.created_at,
+                updated_at=db_member.updated_at,
+            )
+
+    @strawberry.field
+    async def members(self) -> List[Member]:
+        """List all members sorted by last name (nulls last), then first name."""
+        async with async_session_maker() as session:
+            result = await session.execute(
+                select(MemberModel).order_by(
+                    MemberModel.last_name.nulls_last(), MemberModel.first_name
+                )
+            )
+            db_members = result.scalars().all()
+
+            return [
+                Member(
+                    id=m.id,
+                    first_name=m.first_name,
+                    last_name=m.last_name,
+                    street=m.street,
+                    apartment_number=m.apartment_number,
+                    zip=m.zip,
+                    city=m.city,
+                    country=m.country,
+                    email=m.email,
+                    phone=m.phone,
+                    created_at=m.created_at,
+                    updated_at=m.updated_at,
+                )
+                for m in db_members
+            ]
+
+
+@strawberry.type
+class Mutation:
+    @strawberry.mutation
+    async def create_member(self, input: CreateMemberInput) -> Member:
+        """Create a new member with validation."""
+        # Validate required field
+        validate_first_name(input.first_name)
+
+        # Conditional validation (only if fields are provided)
+        validate_email(input.email)
+        validate_phone(input.phone)
+
+        async with async_session_maker() as session:
+            # Create new member
+            db_member = MemberModel(
+                first_name=input.first_name,
+                last_name=input.last_name,
+                street=input.street,
+                apartment_number=input.apartment_number,
+                zip=input.zip,
+                city=input.city,
+                country=input.country,
+                email=input.email,
+                phone=input.phone,
+            )
+
+            session.add(db_member)
+            await session.commit()
+            await session.refresh(db_member)
+
+            return Member(
+                id=db_member.id,
+                first_name=db_member.first_name,
+                last_name=db_member.last_name,
+                street=db_member.street,
+                apartment_number=db_member.apartment_number,
+                zip=db_member.zip,
+                city=db_member.city,
+                country=db_member.country,
+                email=db_member.email,
+                phone=db_member.phone,
+                created_at=db_member.created_at,
+                updated_at=db_member.updated_at,
+            )
+
+    @strawberry.mutation
+    async def update_member(self, input: UpdateMemberInput) -> Member:
+        """Update an existing member."""
+        async with async_session_maker() as session:
+            # Get member
+            result = await session.execute(
+                select(MemberModel).where(MemberModel.id == input.id)
+            )
+            db_member = result.scalar_one_or_none()
+
+            if db_member is None:
+                raise MemberNotFoundError(f"Member with ID {input.id} not found")
+
+            # Validate if fields are being updated
+            if input.first_name is not None:
+                validate_first_name(input.first_name)
+            validate_email(input.email)
+            validate_phone(input.phone)
+
+            # Update fields if provided
+            if input.first_name is not None:
+                db_member.first_name = input.first_name
+            if input.last_name is not None:
+                db_member.last_name = input.last_name
+            if input.street is not None:
+                db_member.street = input.street
+            if input.apartment_number is not None:
+                db_member.apartment_number = input.apartment_number
+            if input.zip is not None:
+                db_member.zip = input.zip
+            if input.city is not None:
+                db_member.city = input.city
+            if input.country is not None:
+                db_member.country = input.country
+            if input.email is not None:
+                db_member.email = input.email
+            if input.phone is not None:
+                db_member.phone = input.phone
+
+            await session.commit()
+            await session.refresh(db_member)
+
+            return Member(
+                id=db_member.id,
+                first_name=db_member.first_name,
+                last_name=db_member.last_name,
+                street=db_member.street,
+                apartment_number=db_member.apartment_number,
+                zip=db_member.zip,
+                city=db_member.city,
+                country=db_member.country,
+                email=db_member.email,
+                phone=db_member.phone,
+                created_at=db_member.created_at,
+                updated_at=db_member.updated_at,
+            )
+
+    @strawberry.mutation
+    async def delete_member(self, id: int) -> bool:
+        """Delete a member by ID."""
+        async with async_session_maker() as session:
+            result = await session.execute(
+                select(MemberModel).where(MemberModel.id == id)
+            )
+            db_member = result.scalar_one_or_none()
+
+            if db_member is None:
+                raise MemberNotFoundError(f"Member with ID {id} not found")
+
+            await session.delete(db_member)
+            await session.commit()
+
+            return True

src/schemas/member.py

@@ -0,0 +1,53 @@
+from datetime import datetime
+from typing import Optional
+
+import strawberry
+
+
+@strawberry.type
+class Member:
+    """GraphQL Member type."""
+
+    id: int
+    first_name: str
+    last_name: Optional[str]
+    street: Optional[str]
+    apartment_number: Optional[str]
+    zip: Optional[str]
+    city: Optional[str]
+    country: Optional[str]
+    email: Optional[str]
+    phone: Optional[str]
+    created_at: datetime
+    updated_at: datetime
+
+
+@strawberry.input
+class CreateMemberInput:
+    """Input type for creating a member - only firstName required."""
+
+    first_name: str
+    last_name: Optional[str] = None
+    street: Optional[str] = None
+    apartment_number: Optional[str] = None
+    zip: Optional[str] = None
+    city: Optional[str] = None
+    country: Optional[str] = None
+    email: Optional[str] = None
+    phone: Optional[str] = None
+
+
+@strawberry.input
+class UpdateMemberInput:
+    """Input type for updating a member - all fields optional except id."""
+
+    id: int
+    first_name: Optional[str] = None
+    last_name: Optional[str] = None
+    street: Optional[str] = None
+    apartment_number: Optional[str] = None
+    zip: Optional[str] = None
+    city: Optional[str] = None
+    country: Optional[str] = None
+    email: Optional[str] = None
+    phone: Optional[str] = None

src/validation.py

@@ -0,0 +1,33 @@
+import re
+from typing import Optional
+
+
+class ValidationError(Exception):
+    """Raised when input validation fails."""
+
+    pass
+
+
+# Compiled regex patterns
+EMAIL_PATTERN = re.compile(r"^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$")
+PHONE_PATTERN = re.compile(r"^\+?[1-9]\d{1,14}$")  # E.164 format
+
+
+def validate_first_name(first_name: str) -> None:
+    """Ensure firstName is provided and non-empty."""
+    if not first_name or first_name.strip() == "":
+        raise ValidationError("firstName cannot be empty")
+
+
+def validate_email(email: Optional[str]) -> None:
+    """Validate email format only if email is provided (not None or empty)."""
+    if email is not None and email != "":
+        if not EMAIL_PATTERN.match(email):
+            raise ValidationError(f"Invalid email format: {email}")
+
+
+def validate_phone(phone: Optional[str]) -> None:
+    """Validate phone format only if phone is provided (not None or empty)."""
+    if phone is not None and phone != "":
+        if not PHONE_PATTERN.match(phone):
+            raise ValidationError(f"Invalid phone format: {phone}")