Add Gamma SBAS production workflow

backend/alembic/versions/0004_sar_analysis_ready_fields.py

@@ -0,0 +1,86 @@
+"""add SAR analysis-ready scene fields
+
+Revision ID: 0004
+Revises: 0003
+Create Date: 2026-05-16
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "0004"
+down_revision: Union[str, None] = "0003"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def _has_table(table_name: str) -> bool:
+    return table_name in set(sa.inspect(op.get_bind()).get_table_names())
+
+
+def _has_column(table_name: str, column_name: str) -> bool:
+    inspector = sa.inspect(op.get_bind())
+    return column_name in {col["name"] for col in inspector.get_columns(table_name)}
+
+
+def _has_index(table_name: str, index_name: str) -> bool:
+    inspector = sa.inspect(op.get_bind())
+    return index_name in {idx["name"] for idx in inspector.get_indexes(table_name)}
+
+
+def _add_column_if_missing(table_name: str, column: sa.Column) -> None:
+    if _has_table(table_name) and not _has_column(table_name, column.name):
+        op.add_column(table_name, column)
+
+
+def _create_index_if_missing(table_name: str, index_name: str, columns: list[str]) -> None:
+    if _has_table(table_name) and not _has_index(table_name, index_name):
+        op.create_index(index_name, table_name, columns)
+
+
+def _drop_index_if_exists(table_name: str, index_name: str) -> None:
+    if _has_table(table_name) and _has_index(table_name, index_name):
+        op.drop_index(index_name, table_name=table_name)
+
+
+def _drop_column_if_exists(table_name: str, column_name: str) -> None:
+    if _has_table(table_name) and _has_column(table_name, column_name):
+        op.drop_column(table_name, column_name)
+
+
+def upgrade() -> None:
+    table = "sar_scene_geo"
+    _add_column_if_missing(table, sa.Column("analysis_tif_path", sa.String(), nullable=True))
+    _add_column_if_missing(table, sa.Column("analysis_dir", sa.String(), nullable=True))
+    _add_column_if_missing(table, sa.Column("analysis_preview_path", sa.String(), nullable=True))
+    _add_column_if_missing(table, sa.Column("analysis_engine", sa.String(length=32), nullable=True))
+    _add_column_if_missing(table, sa.Column("analysis_profile", sa.String(length=64), nullable=True))
+    _add_column_if_missing(table, sa.Column("analysis_backscatter_unit", sa.String(length=32), nullable=True))
+    _add_column_if_missing(table, sa.Column("analysis_nodata_value", sa.Float(), nullable=True))
+    _add_column_if_missing(table, sa.Column("analysis_metadata_json", sa.JSON(), nullable=True))
+    _add_column_if_missing(table, sa.Column("analysis_quality_json", sa.JSON(), nullable=True))
+
+    _create_index_if_missing(table, "ix_sar_scene_geo_analysis_tif_path", ["analysis_tif_path"])
+    _create_index_if_missing(table, "ix_sar_scene_geo_analysis_engine", ["analysis_engine"])
+    _create_index_if_missing(table, "ix_sar_scene_geo_analysis_profile", ["analysis_profile"])
+
+
+def downgrade() -> None:
+    table = "sar_scene_geo"
+    _drop_index_if_exists(table, "ix_sar_scene_geo_analysis_profile")
+    _drop_index_if_exists(table, "ix_sar_scene_geo_analysis_engine")
+    _drop_index_if_exists(table, "ix_sar_scene_geo_analysis_tif_path")
+
+    for column_name in (
+        "analysis_quality_json",
+        "analysis_metadata_json",
+        "analysis_nodata_value",
+        "analysis_backscatter_unit",
+        "analysis_profile",
+        "analysis_engine",
+        "analysis_preview_path",
+        "analysis_dir",
+        "analysis_tif_path",
+    ):
+        _drop_column_if_exists(table, column_name)