diff --git a/src/features/LEAD-10-1772223162203.js b/src/features/LEAD-10-1772223162203.js
new file mode 100644
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+sql
+-- Migration: 001_create_users_table.sql
+-- Description: Create users table with proper constraints and indexes
+-- Created at: 2024-01-15
+
+CREATE TABLE IF NOT EXISTS users (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    email VARCHAR(255) NOT NULL UNIQUE,
+    password_hash VARCHAR(255) NOT NULL,
+    first_name VARCHAR(100) NOT NULL,
+    last_name VARCHAR(100) NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    CONSTRAINT email_not_empty CHECK (email != ''),
+    CONSTRAINT password_hash_not_empty CHECK (password_hash != ''),
+    CONSTRAINT first_name_not_empty CHECK (first_name != ''),
+    CONSTRAINT last_name_not_empty CHECK (last_name != '')
+);
+
+-- Create index on email for faster lookups
+CREATE INDEX idx_users_email ON users(email);
+
+-- Create index on created_at for sorting/filtering
+CREATE INDEX idx_users_created_at ON users(created_at DESC);
+
+-- Create trigger to auto-update updated_at timestamp
+CREATE OR REPLACE FUNCTION update_users_updated_at()
+RETURNS TRIGGER AS $$
+BEGIN
+    NEW.updated_at = CURRENT_TIMESTAMP;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trigger_users_updated_at
+    BEFORE UPDATE ON users
+    FOR EACH ROW
+    EXECUTE FUNCTION update_users_updated_at();
+
+-- Schema Documentation
+/*
+SCHEMA: users
+
+Purpose: Stores user account information and authentication credentials
+
+Fields:
+  - id (UUID): Primary key, automatically generated unique identifier
+  - email (VARCHAR 255): User's email address, must be unique and non-empty
+  - password_hash (VARCHAR 255): Bcrypt/Argon2 hashed password, never plain text
+  - first_name (VARCHAR 100): User's first name, non-empty
+  - last_name (VARCHAR 100): User's last name, non-empty
+  - created_at (TIMESTAMP TZ): Record creation timestamp, auto-set
+  - updated_at (TIMESTAMP TZ): Record last update timestamp, auto-updated
+
+Constraints:
+  - UNIQUE: email (enforced at database level)
+  - NOT NULL: all fields except none
+  - CHECK: non-empty email, password_hash, first_name, last_name
+
+Indexes:
+  - idx_users_email: ON (email) for fast email lookups and uniqueness enforcement
+  - idx_users_created_at: ON (created_at DESC) for chronological queries
+
+Triggers:
+  - trigger_users_updated_at: Automatically updates updated_at on any UPDATE
+
+Notes:
+  - Email should be normalized (lowercase) at application level before insertion
+  - Password must be hashed using bcrypt/Argon2 before storing
+  - UUID provides better distributed system compatibility than serial integers
+*/
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diff --git a/src/features/LEAD-10.js b/src/features/LEAD-10.js
new file mode 100644
index 0000000..0662697
--- /dev/null
+++ b/src/features/LEAD-10.js
@@ -0,0 +1,426 @@
+sql
+-- Migration: 001_create_users_table.sql
+-- Created at: 2024-01-01T00:00:00Z
+-- Description: Create users table with email uniqueness constraint
+
+CREATE TABLE IF NOT EXISTS users (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    email VARCHAR(255) NOT NULL UNIQUE,
+    password_hash VARCHAR(255) NOT NULL,
+    first_name VARCHAR(100) NOT NULL,
+    last_name VARCHAR(100) NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Create index on email for faster lookups
+CREATE INDEX IF NOT EXISTS idx_users_email ON users(email);
+
+-- Create index on created_at for time-based queries
+CREATE INDEX IF NOT EXISTS idx_users_created_at ON users(created_at);
+
+python
+# migrations/001_create_users_table.py
+# Alembic migration file for SQLAlchemy
+
+"""Create users table with email uniqueness constraint
+
+Revision ID: 001
+Revises: 
+Create Date: 2024-01-01 00:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+
+# revision identifiers, used by Alembic.
+revision = '001'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    """Create users table with all required fields and constraints."""
+    op.create_table(
+        'users',
+        sa.Column(
+            'id',
+            postgresql.UUID(as_uuid=True),
+            server_default=sa.text('gen_random_uuid()'),
+            nullable=False
+        ),
+        sa.Column('email', sa.String(255), nullable=False),
+        sa.Column('password_hash', sa.String(255), nullable=False),
+        sa.Column('first_name', sa.String(100), nullable=False),
+        sa.Column('last_name', sa.String(100), nullable=False),
+        sa.Column(
+            'created_at',
+            sa.DateTime(timezone=True),
+            server_default=sa.func.now(),
+            nullable=False
+        ),
+        sa.Column(
+            'updated_at',
+            sa.DateTime(timezone=True),
+            server_default=sa.func.now(),
+            nullable=False
+        ),
+        sa.PrimaryKeyConstraint('id'),
+        sa.UniqueConstraint('email', name='uq_users_email')
+    )
+    
+    # Create indexes
+    op.create_index('idx_users_email', 'users', ['email'], unique=False)
+    op.create_index('idx_users_created_at', 'users', ['created_at'], unique=False)
+
+
+def downgrade() -> None:
+    """Drop users table and all associated indexes."""
+    op.drop_index('idx_users_created_at', table_name='users')
+    op.drop_index('idx_users_email', table_name='users')
+    op.drop_table('users')
+
+python
+# models/user.py
+# SQLAlchemy ORM model
+
+from datetime import datetime
+from typing import Optional
+import uuid
+from sqlalchemy import Column, String, DateTime, Index, UniqueConstraint
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.ext.declarative import declarative_base
+
+Base = declarative_base()
+
+
+class User(Base):
+    """User model representing a user in the database.
+    
+    Attributes:
+        id: Unique identifier (UUID)
+        email: User's email address (unique, indexed)
+        password_hash: Bcrypt hash of user's password
+        first_name: User's first name
+        last_name: User's last name
+        created_at: Timestamp when user was created
+        updated_at: Timestamp when user was last updated
+    """
+    
+    __tablename__ = 'users'
+    __table_args__ = (
+        UniqueConstraint('email', name='uq_users_email'),
+        Index('idx_users_email', 'email'),
+        Index('idx_users_created_at', 'created_at'),
+    )
+    
+    id: Column = Column(
+        UUID(as_uuid=True),
+        primary_key=True,
+        default=uuid.uuid4,
+        nullable=False
+    )
+    email: Column = Column(
+        String(255),
+        nullable=False,
+        unique=True
+    )
+    password_hash: Column = Column(
+        String(255),
+        nullable=False
+    )
+    first_name: Column = Column(
+        String(100),
+        nullable=False
+    )
+    last_name: Column = Column(
+        String(100),
+        nullable=False
+    )
+    created_at: Column = Column(
+        DateTime(timezone=True),
+        default=datetime.utcnow,
+        nullable=False
+    )
+    updated_at: Column = Column(
+        DateTime(timezone=True),
+        default=datetime.utcnow,
+        onupdate=datetime.utcnow,
+        nullable=False
+    )
+    
+    def __repr__(self) -> str:
+        return f"<User(id={self.id}, email={self.email})>"
+    
+    def to_dict(self, include_password: bool = False) -> dict:
+        """Convert user object to dictionary.
+        
+        Args:
+            include_password: Whether to include password_hash in output
+            
+        Returns:
+            Dictionary representation of user
+        """
+        data = {
+            'id': str(self.id),
+            'email': self.email,
+            'first_name': self.first_name,
+            'last_name': self.last_name,
+            'created_at': self.created_at.isoformat() if self.created_at else None,
+            'updated_at': self.updated_at.isoformat() if self.updated_at else None,
+        }
+        if include_password:
+            data['password_hash'] = self.password_hash
+        return data
+
+python
+# tests/test_user_schema.py
+# Unit tests for user schema
+
+import pytest
+from datetime import datetime
+from sqlalchemy import create_engine, exc
+from sqlalchemy.orm import sessionmaker, Session
+from models.user import Base, User
+import uuid
+
+
+@pytest.fixture
+def db_session() -> Session:
+    """Create an in-memory SQLite database for testing."""
+    engine = create_engine('sqlite:///:memory:')
+    Base.metadata.create_all(engine)
+    SessionLocal = sessionmaker(bind=engine)
+    session = SessionLocal()
+    yield session
+    session.close()
+
+
+class TestUserSchema:
+    """Test cases for user schema."""
+    
+    def test_users_table_exists(self, db_session: Session):
+        """Test that users table exists with all required columns."""
+        inspector = db_session.connection().inspector
+        table_names = inspector.get_table_names()
+        assert 'users' in table_names
+        
+        columns = {col['name']: col for col in inspector.get_columns('users')}
+        required_fields = ['id', 'email', 'password_hash', 'first_name', 'last_name', 'created_at', 'updated_at']
+        
+        for field in required_fields:
+            assert field in columns, f"Column {field} not found in users table"
+    
+    def test_insert_valid_user(self, db_session: Session):
+        """Test inserting a valid user."""
+        user = User(
+            email='test@example.com',
+            password_hash='$2b$12$hashed_password_here',
+            first_name='John',
+            last_name='Doe'
+        )
+        db_session.add(user)
+        db_session.commit()
+        
+        retrieved_user = db_session.query(User).filter_by(email='test@example.com').first()
+        assert retrieved_user is not None
+        assert retrieved_user.first_name == 'John'
+        assert retrieved_user.last_name == 'Doe'
+    
+    def test_email_uniqueness_constraint(self, db_session: Session):
+        """Test that duplicate emails are rejected."""
+        user1 = User(
+            email='duplicate@example.com',
+            password_hash='$2b$12$hash1',
+            first_name='John',
+            last_name='Doe'
+        )
+        user2 = User(
+            email='duplicate@example.com',
+            password_hash='$2b$12$hash2',
+            first_name='Jane',
+            last_name='Doe'
+        )
+        
+        db_session.add(user1)
+        db_session.commit()
+        
+        db_session.add(user2)
+        with pytest.raises(exc.IntegrityError):
+            db_session.commit()
+    
+    def test_password_stored_as_hash(self, db_session: Session):
+        """Test that password is stored as hash, not plain text."""
+        plain_password = 'MySecurePassword123!'
+        hashed_password = '$2b$12$abcdefghijklmnopqrst.uvwxyz123456789'
+        
+        user = User(
+            email='test@example.com',
+            password_hash=hashed_password,
+            first_name='John',
+            last_name='Doe'
+        )
+        db_session.add(user)
+        db_session.commit()
+        
+        retrieved_user = db_session.query(User).filter_by(email='test@example.com').first()
+        assert retrieved_user.password_hash == hashed_password
+        assert retrieved_user.password_hash != plain_password
+    
+    def test_timestamps_auto_set(self, db_session: Session):
+        """Test that created_at and updated_at are automatically set."""
+        before_insert = datetime.utcnow()
+        
+        user = User(
+            email='test@example.com',
+            password_hash='$2b$12$hash',
+            first_name='John',
+            last_name='Doe'
+        )
+        db_session.add(user)
+        db_session.commit()
+        
+        after_insert = datetime.utcnow()
+        
+        assert user.created_at is not None
+        assert user.updated_at is not None
+        assert before_insert <= user.created_at <= after_insert
+    
+    def test_email_index_exists(self, db_session: Session):
+        """Test that email index exists for faster lookups."""
+        inspector = db_session.connection().inspector
+        indexes = inspector.get_indexes('users')
+        index_names = [idx['name'] for idx in indexes]
+        
+        assert 'idx_users_email' in index_names
+    
+    def test_user_to_dict_without_password(self, db_session: Session):
+        """Test converting user to dict without password hash."""
+        user = User(
+            email='test@example.com',
+            password_hash='$2b$12$hash',
+            first_name='John',
+            last_name='Doe'
+        )
+        db_session.add(user)
+        db_session.commit()
+        
+        user_dict = user.to_dict(include_password=False)
+        assert 'password_hash' not in user_dict
+        assert user_dict['email'] == 'test@example.com'
+        assert user_dict['first_name'] == 'John'
+    
+    def test_user_to_dict_with_password(self, db_session: Session):
+        """Test converting user to dict with password hash."""
+        user = User(
+            email='test@example.com',
+            password_hash='$2b$12$hash',
+            first_name='John',
+            last_name='Doe'
+        )
+        db_session.add(user)
+        db_session.commit()
+        
+        user_dict = user.to_dict(include_password=True)
+        assert 'password_hash' in user_dict
+        assert user_dict['password_hash'] == '$2b$12$hash'
+
+python
+# database.py
+# Database configuration and utilities
+
+from sqlalchemy import create_engine, event
+from sqlalchemy.orm import sessionmaker, Session
+from sqlalchemy.pool import StaticPool
+import os
+from typing import Generator
+
+# Database connection string
+DATABASE_URL = os.getenv(
+    'DATABASE_URL',
+    'postgresql://user:password@localhost:5432/users_db'
+)
+
+# Create engine with connection pooling
+engine = create_engine(
+    DATABASE_URL,
+    echo=os.getenv('SQL_ECHO', 'False').lower() == 'true',
+    pool_pre_ping=True,  # Test connections before using them
+    pool_recycle=3600,   # Recycle connections after 1 hour
+)
+
+# Session factory
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def get_db() -> Generator[Session, None, None]:
+    """Dependency for getting database session.
+    
+    Yields:
+        SQLAlchemy Session
+    """
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def init_db() -> None:
+    """Initialize database by creating all tables."""
+    from models.user import Base
+    Base.metadata.create_all(bind=engine)
+
+
+# Enable foreign key constraints for SQLite (if using SQLite)
+@event.listens_for(engine, "connect")
+def set_sqlite_pragma(dbapi_conn, connection_record):
+    """Set SQLite pragmas for better constraints."""
+    if 'sqlite' in str(engine.url):
+        cursor = dbapi_conn.cursor()
+        cursor.execute("PRAGMA foreign_keys=ON")
+        cursor.close()
+
+makefile
+# Makefile
+# Common database operations
+
+.PHONY: db-init db-migrate db-upgrade db-downgrade db-fresh db-seed test clean
+
+# Initialize database
+db-init:
+	python -c "from database import init_db; init_db()"
+	@echo "Database initialized successfully"
+
+# Run migrations
+db-migrate:
+	alembic revision --autogenerate -m "$(message)"
+
+# Upgrade to latest migration
+db-upgrade:
+	alembic upgrade head
+
+# Downgrade one migration
+db-downgrade:
+	alembic downgrade -1
+
+# Fresh database (drop and recreate)
+db-fresh: clean db-init
+	@echo "Database reset successfully"
+
+# Run tests
+test:
+	pytest tests/test_user_schema.py -v
+
+# Clean database
+clean:
+	find . -name "*.db" -delete
+	find . -name "__pycache__" -type d -delete
+
+.DEFAULT_GOAL := help
+help:
+	@echo "Available database commands:"
+	@grep -E "^[a-z-]+:" Makefile | sed 's/:.*//g' | column
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