feat: implement mvp with email-first login flow and langgraph architecture

alembic/README

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+Generic single-database configuration.

alembic/env.py

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+from logging.config import fileConfig
+import os
+import sys
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# Add src to path to ensure we can import the app
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), '../src'))
+
+from ea_chatbot.config import Settings
+from ea_chatbot.history.models import Base
+
+# 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
+target_metadata = Base.metadata
+
+# Override sqlalchemy.url from settings
+settings = Settings()
+config.set_main_option("sqlalchemy.url", settings.history_db_url)
+
+
+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()

alembic/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"}

alembic/versions/63886baa1255_add_summary_to_conversation.py

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+"""Add summary to conversation
+
+Revision ID: 63886baa1255
+Revises: a15fde9a62df
+Create Date: 2026-02-07 22:34:47.254569
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '63886baa1255'
+down_revision: Union[str, Sequence[str], None] = 'a15fde9a62df'
+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.add_column('conversations', sa.Column('summary', sa.Text(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('conversations', 'summary')
+    # ### end Alembic commands ###

alembic/versions/a15fde9a62df_initial_history_tables.py

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+"""Initial history tables
+
+Revision ID: a15fde9a62df
+Revises: 
+Create Date: 2026-02-07 21:18:57.524534
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'a15fde9a62df'
+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('users',
+    sa.Column('id', sa.String(), nullable=False),
+    sa.Column('username', sa.String(), nullable=False),
+    sa.Column('password_hash', sa.String(), nullable=True),
+    sa.Column('display_name', sa.String(), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_users_username'), 'users', ['username'], unique=True)
+    op.create_table('conversations',
+    sa.Column('id', sa.String(), nullable=False),
+    sa.Column('user_id', sa.String(), nullable=False),
+    sa.Column('data_state', sa.String(), nullable=False),
+    sa.Column('name', sa.String(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=False),
+    sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_table('messages',
+    sa.Column('id', sa.String(), nullable=False),
+    sa.Column('conversation_id', sa.String(), nullable=False),
+    sa.Column('role', sa.String(), nullable=False),
+    sa.Column('content', sa.Text(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=False),
+    sa.ForeignKeyConstraint(['conversation_id'], ['conversations.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_table('plots',
+    sa.Column('id', sa.String(), nullable=False),
+    sa.Column('message_id', sa.String(), nullable=False),
+    sa.Column('image_data', sa.LargeBinary(), nullable=False),
+    sa.ForeignKeyConstraint(['message_id'], ['messages.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('plots')
+    op.drop_table('messages')
+    op.drop_table('conversations')
+    op.drop_index(op.f('ix_users_username'), table_name='users')
+    op.drop_table('users')
+    # ### end Alembic commands ###