Initial commit: Backend API Phase 1a complete

- FastAPI backend with JWT auth
- PostgreSQL database schema
- Trees and Sessions CRUD APIs
- Export functionality (Markdown, Text, HTML)
- Docker setup for local development
- Alembic migrations

backend/alembic/env.py

@@ -0,0 +1,81 @@
+import asyncio
+from logging.config import fileConfig
+
+from sqlalchemy import pool
+from sqlalchemy.engine import Connection
+from sqlalchemy.ext.asyncio import async_engine_from_config
+
+from alembic import context
+
+# Import your models
+from app.core.database import Base
+from app.models import User, Team, Tree, Session, Attachment
+from app.core.config import settings
+
+# this is the Alembic Config object
+config = context.config
+
+# Override sqlalchemy.url with the sync version for migrations
+config.set_main_option("sqlalchemy.url", settings.DATABASE_URL_SYNC)
+
+# Interpret the config file for Python logging.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+target_metadata = Base.metadata
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode."""
+    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:
+    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 engine."""
+    from sqlalchemy.ext.asyncio import create_async_engine
+
+    connectable = create_async_engine(
+        settings.DATABASE_URL,
+        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."""
+    from sqlalchemy import create_engine
+
+    connectable = create_engine(
+        settings.DATABASE_URL_SYNC,
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        do_run_migrations(connection)
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

backend/alembic/script.py.mako

@@ -0,0 +1,26 @@
+"""${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, 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:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

backend/alembic/versions/001_initial_schema.py

@@ -0,0 +1,124 @@
+"""Initial schema
+
+Revision ID: 001
+Revises:
+Create Date: 2026-01-22
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision: str = '001'
+down_revision: Union[str, None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Create teams table
+    op.create_table(
+        'teams',
+        sa.Column('id', postgresql.UUID(as_uuid=True), server_default=sa.text('gen_random_uuid()'), nullable=False),
+        sa.Column('name', sa.String(255), nullable=False),
+        sa.Column('created_at', sa.DateTime(), server_default=sa.text('NOW()'), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+
+    # Create users table
+    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('name', sa.String(255), nullable=False),
+        sa.Column('role', sa.String(50), nullable=False, server_default='engineer'),
+        sa.Column('team_id', postgresql.UUID(as_uuid=True), nullable=True),
+        sa.Column('created_at', sa.DateTime(), server_default=sa.text('NOW()'), nullable=True),
+        sa.Column('last_login', sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(['team_id'], ['teams.id'], ),
+        sa.PrimaryKeyConstraint('id'),
+        sa.UniqueConstraint('email')
+    )
+    op.create_index('idx_users_email', 'users', ['email'], unique=True)
+
+    # Create trees table
+    op.create_table(
+        'trees',
+        sa.Column('id', postgresql.UUID(as_uuid=True), server_default=sa.text('gen_random_uuid()'), nullable=False),
+        sa.Column('name', sa.String(255), nullable=False),
+        sa.Column('description', sa.Text(), nullable=True),
+        sa.Column('category', sa.String(100), nullable=True),
+        sa.Column('tree_structure', postgresql.JSONB(astext_type=sa.Text()), nullable=False),
+        sa.Column('author_id', postgresql.UUID(as_uuid=True), nullable=True),
+        sa.Column('team_id', postgresql.UUID(as_uuid=True), nullable=True),
+        sa.Column('is_active', sa.Boolean(), server_default='true', nullable=True),
+        sa.Column('version', sa.Integer(), server_default='1', nullable=True),
+        sa.Column('created_at', sa.DateTime(), server_default=sa.text('NOW()'), nullable=True),
+        sa.Column('updated_at', sa.DateTime(), server_default=sa.text('NOW()'), nullable=True),
+        sa.Column('usage_count', sa.Integer(), server_default='0', nullable=True),
+        sa.ForeignKeyConstraint(['author_id'], ['users.id'], ),
+        sa.ForeignKeyConstraint(['team_id'], ['teams.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index('idx_trees_category', 'trees', ['category'], unique=False)
+    op.create_index('idx_trees_team', 'trees', ['team_id'], unique=False)
+    # Full-text search index
+    op.execute(
+        "CREATE INDEX idx_trees_search ON trees USING gin(to_tsvector('english', coalesce(name, '') || ' ' || coalesce(description, '')))"
+    )
+
+    # Create sessions table
+    op.create_table(
+        'sessions',
+        sa.Column('id', postgresql.UUID(as_uuid=True), server_default=sa.text('gen_random_uuid()'), nullable=False),
+        sa.Column('tree_id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('user_id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('tree_snapshot', postgresql.JSONB(astext_type=sa.Text()), nullable=False),
+        sa.Column('path_taken', postgresql.JSONB(astext_type=sa.Text()), nullable=False, server_default='[]'),
+        sa.Column('decisions', postgresql.JSONB(astext_type=sa.Text()), nullable=False, server_default='[]'),
+        sa.Column('started_at', sa.DateTime(), server_default=sa.text('NOW()'), nullable=True),
+        sa.Column('completed_at', sa.DateTime(), nullable=True),
+        sa.Column('ticket_number', sa.String(100), nullable=True),
+        sa.Column('client_name', sa.String(255), nullable=True),
+        sa.Column('exported', sa.Boolean(), server_default='false', nullable=True),
+        sa.ForeignKeyConstraint(['tree_id'], ['trees.id'], ),
+        sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index('idx_sessions_user', 'sessions', ['user_id'], unique=False)
+    op.create_index('idx_sessions_tree', 'sessions', ['tree_id'], unique=False)
+    op.create_index('idx_sessions_dates', 'sessions', ['started_at', 'completed_at'], unique=False)
+
+    # Create attachments table
+    op.create_table(
+        'attachments',
+        sa.Column('id', postgresql.UUID(as_uuid=True), server_default=sa.text('gen_random_uuid()'), nullable=False),
+        sa.Column('session_id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('node_id', sa.String(100), nullable=True),
+        sa.Column('file_name', sa.String(255), nullable=False),
+        sa.Column('file_type', sa.String(50), nullable=True),
+        sa.Column('file_size', sa.Integer(), nullable=True),
+        sa.Column('storage_path', sa.String(500), nullable=True),
+        sa.Column('uploaded_at', sa.DateTime(), server_default=sa.text('NOW()'), nullable=True),
+        sa.ForeignKeyConstraint(['session_id'], ['sessions.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+
+
+def downgrade() -> None:
+    op.drop_table('attachments')
+    op.drop_index('idx_sessions_dates', table_name='sessions')
+    op.drop_index('idx_sessions_tree', table_name='sessions')
+    op.drop_index('idx_sessions_user', table_name='sessions')
+    op.drop_table('sessions')
+    op.drop_index('idx_trees_search', table_name='trees')
+    op.drop_index('idx_trees_team', table_name='trees')
+    op.drop_index('idx_trees_category', table_name='trees')
+    op.drop_table('trees')
+    op.drop_index('idx_users_email', table_name='users')
+    op.drop_table('users')
+    op.drop_table('teams')