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+"""为地块表添加PostGIS空间字段支持
+
+Revision ID: d95875797265
+Revises: 55c85ceea855
+Create Date: 2025-11-21 11:03:22.171351
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+import geoalchemy2.types
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'd95875797265'
+down_revision: Union[str, Sequence[str], None] = '55c85ceea855'
+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.drop_index(op.f('ix_patrol_records_field_date'), table_name='farm_work_patrol_records')
+    op.create_index('ix_patrol_records_field_date', 'farm_work_patrol_records', ['field_id', 'inspection_date'], unique=False, postgresql_ops={'inspection_date': 'DESC'})
+    op.drop_index(op.f('ix_patrol_records_tenant_date'), table_name='farm_work_patrol_records')
+    op.create_index('ix_patrol_records_tenant_date', 'farm_work_patrol_records', ['tenant_id', 'inspection_date'], unique=False, postgresql_ops={'inspection_date': 'DESC'})
+    # 使用原生SQL添加空间字段和索引，避免重复创建错误
+    op.execute('ALTER TABLE fields ADD COLUMN IF NOT EXISTS geometry GEOMETRY(POLYGON, 4326);')
+    op.execute('ALTER TABLE fields ADD COLUMN IF NOT EXISTS centroid GEOMETRY(POINT, 4326);')
+    op.execute('COMMENT ON COLUMN fields.geometry IS \'地块边界多边形（PostGIS几何格式，支持空间查询）\';')
+    op.execute('COMMENT ON COLUMN fields.centroid IS \'地块中心点（PostGIS几何格式，用于距离计算）\';')
+
+    # 创建空间索引（使用IF NOT EXISTS避免重复）
+    op.execute('CREATE INDEX IF NOT EXISTS idx_fields_geometry ON fields USING GIST (geometry);')
+    op.execute('CREATE INDEX IF NOT EXISTS idx_fields_centroid ON fields USING GIST (centroid);')
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index('idx_fields_geometry', table_name='fields', postgresql_using='gist')
+    op.drop_index('idx_fields_centroid', table_name='fields', postgresql_using='gist')
+    op.drop_column('fields', 'centroid')
+    op.drop_column('fields', 'geometry')
+    op.drop_index('ix_patrol_records_tenant_date', table_name='farm_work_patrol_records', postgresql_ops={'inspection_date': 'DESC'})
+    op.create_index(op.f('ix_patrol_records_tenant_date'), 'farm_work_patrol_records', ['tenant_id', sa.literal_column('inspection_date DESC')], unique=False)
+    op.drop_index('ix_patrol_records_field_date', table_name='farm_work_patrol_records', postgresql_ops={'inspection_date': 'DESC'})
+    op.create_index(op.f('ix_patrol_records_field_date'), 'farm_work_patrol_records', ['field_id', sa.literal_column('inspection_date DESC')], unique=False)
+    # ### end Alembic commands ###