Refactor code structure for improved readability and maintainability

backend/src/db/migrate.ts

@@ -35,6 +35,7 @@ async function main() {
       every_json text NOT NULL DEFAULT '[]',
       start_json text NOT NULL DEFAULT '[]',
       strip_size integer NOT NULL DEFAULT 1,
+      image_url text,
       updated_at integer NOT NULL DEFAULT (strftime('%s','now'))
     );
 

backend/src/db/schema.ts

@@ -23,6 +23,7 @@ export const medications = sqliteTable("medications", {
   everyJson: text("every_json").notNull().default("[]"),
   startJson: text("start_json").notNull().default("[]"),
   stripSize: integer("strip_size").notNull().default(1),
+  imageUrl: text("image_url"),
   updatedAt: integer("updated_at", { mode: "timestamp" }).notNull().default(sql`CURRENT_TIMESTAMP`),
 });