add sql for creating library_item_preview db table

packages/db/migrations/0121.do.library_item_preview.sql

@@ -0,0 +1,21 @@
+-- Type: DO
+-- Name: library_item_preview
+-- Description: Create library_item_preview table
+
+BEGIN;
+
+CREATE TABLE omnivore.library_item_preview (
+    id uuid PRIMARY KEY DEFAULT uuid_generate_v1mc(),
+    sender_id uuid NOT NULL REFERENCES omnivore.user ON DELETE CASCADE,
+    recipient_ids uuid[] NOT NULL, -- Array of user ids
+    library_item_id uuid NOT NULL REFERENCES omnivore.library_item(id) ON DELETE CASCADE,
+    thumbnail text,
+    includes_note bool NOT NULL DEFAULT false,
+    includes_highlight bool NOT NULL DEFAULT false,
+    created_at timestamptz NOT NULL DEFAULT current_timestamp,
+    updated_at timestamptz NOT NULL DEFAULT current_timestamp
+);
+
+CREATE TRIGGER update_library_item_preview_modtime BEFORE UPDATE ON omnivore.library_item_preview FOR EACH ROW EXECUTE PROCEDURE update_updated_at_column();
+
+COMMIT;

packages/db/migrations/0121.undo.library_item_preview.sql

@@ -0,0 +1,11 @@
+-- Type: UNDO
+-- Name: library_item_preview
+-- Description: Create library_item_preview table
+
+BEGIN;
+
+DROP TRIGGER update_library_item_preview_modtime;
+
+DROP TABLE omnivore.library_item_preview;
+
+COMMIT;