better migrations

migrations/versions/add_events_table.py

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+"""create events table
+
+Revision ID: add_events_table
+Revises: f18735338888
+Create Date: 2024-03-19 10:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy import inspect
+
+# revision identifiers, used by Alembic.
+revision = 'add_events_table'
+down_revision = 'f18735338888'
+branch_labels = None
+depends_on = None
+
+def upgrade():
+    conn = op.get_bind()
+    inspector = inspect(conn)
+    tables = inspector.get_table_names()
+    
+    if 'events' not in tables:
+        op.create_table(
+            'events',
+            sa.Column('id', sa.Integer, primary_key=True),
+            sa.Column('event_type', sa.String(50), nullable=False),
+            sa.Column('user_id', sa.Integer, sa.ForeignKey('user.id'), nullable=True),
+            sa.Column('timestamp', sa.DateTime, nullable=False),
+            sa.Column('details', sa.JSON),
+            sa.Column('ip_address', sa.String(45)),
+            sa.Column('user_agent', sa.String(255)),
+        )
+        op.create_index('idx_events_event_type', 'events', ['event_type'])
+        op.create_index('idx_events_timestamp', 'events', ['timestamp'])
+        op.create_index('idx_events_user_id', 'events', ['user_id'])
+
+def downgrade():
+    op.drop_index('idx_events_event_type', table_name='events')
+    op.drop_index('idx_events_timestamp', table_name='events')
+    op.drop_index('idx_events_user_id', table_name='events')
+    op.drop_table('events') 

migrations/versions/add_notifs_table.py

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+"""create notifs table
+
+Revision ID: add_notifs_table
+Revises: add_events_table
+Create Date: 2024-03-19 10:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy import inspect
+
+# revision identifiers, used by Alembic.
+revision = 'add_notifs_table'
+down_revision = 'add_events_table'
+branch_labels = None
+depends_on = None
+
+def upgrade():
+    conn = op.get_bind()
+    inspector = inspect(conn)
+    tables = inspector.get_table_names()
+    
+    if 'notifs' not in tables:
+        op.create_table(
+            'notifs',
+            sa.Column('id', sa.Integer, primary_key=True),
+            sa.Column('notif_type', sa.String(50), nullable=False),
+            sa.Column('user_id', sa.Integer, sa.ForeignKey('user.id'), nullable=False),
+            sa.Column('sender_id', sa.Integer, sa.ForeignKey('user.id'), nullable=True),
+            sa.Column('timestamp', sa.DateTime, nullable=False),
+            sa.Column('read', sa.Boolean, nullable=False, default=False),
+            sa.Column('details', sa.JSON),
+        )
+        op.create_index('idx_notifs_notif_type', 'notifs', ['notif_type'])
+        op.create_index('idx_notifs_timestamp', 'notifs', ['timestamp'])
+        op.create_index('idx_notifs_user_id', 'notifs', ['user_id'])
+        op.create_index('idx_notifs_sender_id', 'notifs', ['sender_id'])
+        op.create_index('idx_notifs_read', 'notifs', ['read'])
+
+def downgrade():
+    op.drop_index('idx_notifs_notif_type', table_name='notifs')
+    op.drop_index('idx_notifs_timestamp', table_name='notifs')
+    op.drop_index('idx_notifs_user_id', table_name='notifs')
+    op.drop_index('idx_notifs_sender_id', table_name='notifs')
+    op.drop_index('idx_notifs_read', table_name='notifs')
+    op.drop_table('notifs') 

migrations/versions/make_events_user_id_nullable.py

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+"""make events user_id nullable
+
+Revision ID: make_events_user_id_nullable
+Revises: f18735338888
+Create Date: 2024-03-19 10:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = 'make_events_user_id_nullable'
+down_revision = 'f18735338888'  # This should be the latest migration
+branch_labels = None
+depends_on = None
+
+def upgrade():
+    # Make user_id nullable in events table
+    op.alter_column('events', 'user_id',
+               existing_type=sa.Integer(),
+               nullable=True)
+
+def downgrade():
+    # Make user_id non-nullable again
+    op.alter_column('events', 'user_id',
+               existing_type=sa.Integer(),
+               nullable=False)