Add migration for Lake

alembic/versions/20250325_114539_a5aad946_create_lake.py

@@ -0,0 +1,50 @@
+"""create lakes table
+
+Revision ID: 1234567890ab
+Revises: 
+Create Date: 2023-05-25 10:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects.postgresql import UUID
+
+
+# revision identifiers, used by Alembic
+revision = '1234567890ab'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.create_table(
+        'lakes',
+        sa.Column('id', UUID(as_uuid=True), primary_key=True),
+        sa.Column('name', sa.String, nullable=False, unique=True),
+        sa.Column('description', sa.Text, nullable=True),
+        sa.Column('location', sa.String, nullable=False),
+        sa.Column('created_at', sa.DateTime, server_default=sa.func.now()),
+        sa.Column('updated_at', sa.DateTime, server_default=sa.func.now(), onupdate=sa.func.now()),
+        sa.PrimaryKeyConstraint('id'),
+        sa.Index('ix_lakes_name', 'name')
+    )
+
+
+def downgrade():
+    op.drop_index('ix_lakes_name', 'lakes')
+    op.drop_table('lakes')
+```
+
+This Alembic migration script creates a new table called 'lakes' with the following columns:
+
+- `id` (UUID primary key)
+- `name` (String, not nullable, unique, indexed)
+- `description` (Text, nullable)
+- `location` (String, not nullable)
+- `created_at` (DateTime, server default to current timestamp)
+- `updated_at` (DateTime, server default to current timestamp, updated on each record change)
+
+The `upgrade()` function creates the table and the index on the `name` column.
+
+The `downgrade()` function drops the index and the table, effectively reversing the changes made by the `upgrade()` function.