Add clump migration

migrations/20190317174940_clumps.sql

@@ -0,0 +1,17 @@
+-- +goose Up
+-- SQL in this section is executed when the migration is applied.
+
+ALTER TABLE paste RENAME COLUMN title TO filename;
+CREATE TABLE clump (
+	clumpID SERIAL PRIMARY KEY,
+	title VARCHAR(512),
+	handle uuid UNIQUE
+);
+ALTER TABLE paste ADD COLUMN clumpID INTEGER DEFAULT NULL REFERENCES clump(clumpID) ON DELETE CASCADE;
+
+-- +goose Down
+-- SQL in this section is executed when the migration is rolled back.
+
+ALTER TABLE paste RENAME COLUMN filename TO paste;
+ALTER TABLE paste DROP COLUMN clumpID;
+DROP TABLE clump;