Defined the schema for the Data Source table

Ran migration to generate new table
includes annoying lint change

Author: horatiorosa

db/migration/0037_gorgeous_pet_avengers.sql

@@ -0,0 +1,6 @@
+CREATE TABLE "data_source" (
+	"schema_name" text PRIMARY KEY NOT NULL,
+	"dataset_name" text,
+	"version" text NOT NULL,
+	"retrieve_date" date NOT NULL
+);