Replace the unique constraint on library_item table with a unique index of userId and md5 hashed original url

packages/db/migrations/0127.do.replace_unique_index_on_library_item.sql

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+-- Type: DO
+-- Name: replace_unique_index_on_library_item
+-- Description: Create a unique index of MD5 hashed url and userId on library item table
+
+BEGIN;
+
+ALTER TABLE omnivore.library_item DROP CONSTRAINT IF EXISTS library_item_user_id_original_url_key;
+CREATE UNIQUE INDEX library_item_user_id_hashed_original_url_key ON omnivore.library_item (user_id, md5(original_url));
+
+COMMIT;

packages/db/migrations/0127.undo.replace_unique_index_on_library_item.sql

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+-- Type: UNDO
+-- Name: replace_unique_index_on_library_item
+-- Description: Create a unique index of MD5 hashed url and userId on library item table
+
+BEGIN;
+
+DROP INDEX IF EXISTS omnivore.library_item_user_id_hashed_original_url_key;
+ALTER TABLE omnivore.library_item ADD CONSTRAINT library_item_user_id_original_url_key UNIQUE (user_id, original_url);
+
+COMMIT;