mod - tx_body migration file from cabal, rather than handwritten.

schema/migration-2-0002-20200625.sql

@@ -0,0 +1,20 @@
+-- Persistent generated migration.
+
+CREATE FUNCTION migrate() RETURNS void AS $$
+DECLARE
+  next_version int ;
+BEGIN
+  SELECT stage_two + 1 INTO next_version FROM schema_version ;
+  IF next_version = 2 THEN
+    EXECUTE 'CREATe TABLE "tx_body"("id" SERIAL8  PRIMARY KEY UNIQUE,"hash" hash32type NOT NULL,"body" bytea NOT NULL)' ;
+    EXECUTE 'ALTER TABLE "tx_body" ADD CONSTRAINT "unique_tx_body" UNIQUE("hash")' ;
+    -- Hand written SQL statements can be added here.
+    UPDATE schema_version SET stage_two = 2 ;
+    RAISE NOTICE 'DB has been migrated to stage_two version %', next_version ;
+  END IF ;
+END ;
+$$ LANGUAGE plpgsql ;
+
+SELECT migrate() ;
+
+DROP FUNCTION migrate() ;