Learning Objectives

• Design complex database schema
• Implement relationships and indexes
• Use Alembic for migrations

Database Schema

Migration Example

python
Run Inline
# alembic/versions/xxx_create_tables.py
from alembic import op
import sqlalchemy as sa
def upgrade():
    op.create_table('products',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('name', sa.String(200), nullable=False),
        sa.Column('price', sa.Float(), nullable=False),
        sa.Column('category_id', sa.Integer(), sa.ForeignKey('categories.id')),
        sa.Column('created_at', sa.DateTime(), server_default=sa.func.now()),
        sa.PrimaryKeyConstraint('id')
    )
    op.create_index('idx_product_category', 'products', ['category_id'])

• Design E-R diagram before coding
• Use proper foreign keys and constraints
• Add indexes for frequently queried columns
• Implement soft deletes where appropriate Join Discord PreviousMilestone 1: Advanced Architecture SetupNextMilestone 3: Authentication & Authorization