feat: mock exercise template api (#613)

* feat: move mock exercise template to api

* feat: add template migration file

* chore:
- remove exercise templates form api
- rework api to pull exercise templates from db
- add exercise template seed to seed file
- declutter seed file

* chore:
- refactor template fetch to be dependent on the selected tag
- add tag to schema, remote db and template's seed file
- clear remote db's template table and replace data and their respective tags

* chore: add number of questions and center loading screen on the frontend

* chore: pr fixes

* chore: type fixes

* chore:
- move seed functionality to /seed folder
- add typing for individual seed functions
- pr fixes

* chore: pr fixes v2

* update output css

* refactor: update seeding script and schema definitions

- Renamed `seedTypes` to `seedQuestionTypes` for clarity in the seeding process.
- Enhanced the seeding script to include a command-line interface for better usability, allowing specific seed functions to be executed based on flags.
- Removed redundant unique constraints in the schema definitions for `courseNewsfeedComment` and `exerciseTemplate` to streamline database structure.

* feat: add email verification error handling page and update session management

- Introduced a new page for handling email verification errors, providing user-friendly messages based on error types.
- Updated session management logic to improve handling of public routes and session states.
- Enhanced security policies in the Svelte configuration to include additional sources for styles and scripts.
- Removed the old email verification error page to streamline the codebase.

* move the exercise template to cloudflare cdn

---------

Co-authored-by: Rotimi Best <best@classroomio.com>

packages/db/src/schema.ts

@@ -898,8 +898,7 @@ export const courseNewsfeedComment = pgTable(
       columns: [table.courseNewsfeedId],
       foreignColumns: [courseNewsfeed.id],
       name: 'course_newsfeed_comment_course_newsfeed_id_fkey'
-    }),
-    unique('course_newsfeed_comment_id_key').on(table.id)
+    })
   ]
 );
 
@@ -1312,3 +1311,45 @@ export const lessonVersions = pgView('lesson_versions', {
 }).as(
   sql`SELECT llh.old_content, llh.new_content, llh."timestamp", ll.locale, ll.lesson_id FROM lesson_language_history llh JOIN lesson_language ll ON ll.id = llh.lesson_language_id`
 );
+
+export const exerciseTemplate = pgTable('exercise_template', {
+  id: bigint({ mode: 'number' }).primaryKey().generatedByDefaultAsIdentity({
+    name: 'exercise_template_id_seq',
+    startWith: 1,
+    increment: 1,
+    minValue: 1,
+    cache: 1
+  }),
+  createdAt: timestamp('created_at', { withTimezone: true, mode: 'string' }).defaultNow().notNull(),
+  title: text(),
+  description: text(),
+  tag: text(),
+  questionnaire: jsonb().default({}).$type<{
+    questions: [
+      {
+        title: string;
+        name: string;
+        points: number;
+        order: number;
+        question_type: {
+          id: number;
+          label: string;
+        };
+        options: [
+          {
+            label: string;
+            is_correct: boolean;
+          },
+          {
+            label: string;
+            is_correct: boolean;
+          },
+          {
+            label: string;
+            is_correct: boolean;
+          }
+        ];
+      }
+    ];
+  }>()
+});