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

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 ###