Add some initial Sqitch migrations

These are based on the state of the current manually managed database.

sqitch/verify/appschema.sql

@@ -0,0 +1,7 @@
+-- Verify guix-data-service:appschema on pg
+
+BEGIN;
+
+SELECT pg_catalog.has_schema_privilege('guix_data_service', 'usage');
+
+ROLLBACK;

sqitch/verify/buildstatus_enum.sql

@@ -0,0 +1,7 @@
+-- Verify guix-data-service:buildstatus_enum on pg
+
+BEGIN;
+
+SELECT pg_catalog.has_type_privilege('guix_data_service.buildstatus', 'usage');
+
+ROLLBACK;

sqitch/verify/initial_import.sql

@@ -0,0 +1,50 @@
+-- Verify guix-data-service:initial_import on pg
+
+BEGIN;
+
+SELECT id, url, lookup_all_derivations
+  FROM guix_data_service.build_servers WHERE FALSE;
+
+SELECT id, status_fetched_at, internal_build_id, starttime, stoptime status
+  FROM guix_data_service.build_status WHERE FALSE;
+
+SELECT internal_id, id, build_server_id, derivation_id
+  FROM guix_data_service.builds WHERE FALSE;
+
+SELECT derivation_id, derivation_output_id
+  FROM guix_data_service.derivation_inputs WHERE FALSE;
+
+SELECT id, path, hash_algorithm, hash, recursive
+  FROM guix_data_service.derivation_output_details WHERE FALSE;
+
+SELECT derivation_id, name, derivation_output_details_id, id
+  FROM guix_data_service.derivation_outputs WHERE FALSE;
+
+SELECT id, store_path
+  FROM guix_data_service.derivation_source_files WHERE FALSE;
+
+SELECT derivation_id, derivation_source_file_id
+  FROM guix_data_service.derivation_sources WHERE FALSE;
+
+SELECT id, file_name, builder, args, env_vars, system
+  FROM guix_data_service.derivations WHERE FALSE;
+
+SELECT revision_id, package_derivation_id
+  FROM guix_data_service.guix_revision_package_derivations WHERE FALSE;
+
+SELECT id, url, commit, store_path
+  FROM guix_data_service.guix_revisions WHERE FALSE;
+
+SELECT id, url, commit, source
+  FROM guix_data_service.load_new_guix_revision_jobs WHERE FALSE;
+
+SELECT id, package_id, derivation_id, system, target
+  FROM guix_data_service.package_derivations WHERE FALSE;
+
+SELECT id, sha1_hash, synopsis, description, home_page
+  FROM guix_data_service.package_metadata WHERE FALSE;
+
+SELECT id, name, version, package_metadata_id
+  FROM guix_data_service.packages WHERE FALSE;
+
+ROLLBACK;