fix some issues

Signed-off-by: Kenneth Obsequio <k80308392@gmail.com>

controllers/admin/courses.controller.js

@@ -16,6 +16,8 @@ const { getFieldValues } = require("../../utils/fieldValues.util");
 const logActivity = require('../../utils/logActivity.util');
 const UserNotification = require('../../models/notifications/user_notification.mdl');
 const { NOTIFICATION_REGISTRY } = require('../../data/notifications.data');
+const CompletionRequirement = require('../../models/courses/completion_requirement.mdl');
+const { VALID_ENTITY_TYPES } = require('../../utils/courses/completion_requirements.registry');
 
 // ── Models ────────────────────────────────────────────────────────────────────
 
@@ -218,6 +220,23 @@ exports.createCourseFull = async (req, res) => {
         await t.rollback();
         return R.error(res, "Each new unit needs a title.", 400);
       }
+      // Requirements only apply to units being created fresh here — units
+      // attached by unit_id already have their own configured set.
+      if (!unit.unit_id && unit.requirements?.length) {
+        const seenTypes = new Set();
+        for (const r of unit.requirements) {
+          const allowedEntityTypes = VALID_ENTITY_TYPES[r.type];
+          if (!allowedEntityTypes || !allowedEntityTypes.includes("unit")) {
+            await t.rollback();
+            return R.error(res, `"${r.type}" cannot be configured on a unit.`, 400);
+          }
+          if (seenTypes.has(r.type)) {
+            await t.rollback();
+            return R.error(res, `Duplicate "${r.type}" requirement — only one per unit is allowed.`, 400);
+          }
+          seenTypes.add(r.type);
+        }
+      }
       for (const lesson of unit.lessons ?? []) {
         if (!lesson.lesson_id && !lesson.title) {
           await t.rollback();
@@ -301,6 +320,21 @@ exports.createCourseFull = async (req, res) => {
           duration_seconds: 0,
           createdBy: by,
         }, { transaction: t });
+
+        if (unitInput.requirements?.length) {
+          const rows = unitInput.requirements.map((r, ri) => ({
+            entity_type: "unit",
+            entity_id: unit.unit_id,
+            type: r.type,
+            order: r.order ?? ri,
+            min_percent: r.type === "watch_percent" ? (r.min_percent ?? 100) : null,
+            button_label: r.type === "manual_complete" ? (r.button_label || null) : null,
+            is_required: r.is_required ?? true,
+            createdBy: by,
+            updatedBy: by,
+          }));
+          await CompletionRequirement.bulkCreate(rows, { transaction: t });
+        }
       }
 
       await CourseUnit.create({
@@ -658,10 +692,15 @@ exports.syncPrerequisites = async (req, res) => {
 // ══════════════════════════════════════════════════════════════════════════════
 
 // Literal fragments that resolve a unit's order within THIS course.
+// course_id is a 19-digit snowflake-style BIGINT — well past
+// Number.MAX_SAFE_INTEGER, so Number(courseId) silently rounds to the wrong
+// id and these subqueries match nothing. BigInt preserves full precision
+// (and throws on non-numeric input, same effect as the old NaN would've had
+// via the caller's try/catch).
 const courseOrderLiteral = (courseId) =>
-  `(SELECT cu.order_index FROM course_units cu WHERE cu.course_id = ${Number(courseId)} AND cu.unit_id = "Unit"."unit_id" LIMIT 1)`;
+  `(SELECT cu.order_index FROM course_units cu WHERE cu.course_id = ${BigInt(courseId)} AND cu.unit_id = "Unit"."unit_id" LIMIT 1)`;
 const courseMembershipLiteral = (courseId) =>
-  `(SELECT cu.unit_id FROM course_units cu WHERE cu.course_id = ${Number(courseId)})`;
+  `(SELECT cu.unit_id FROM course_units cu WHERE cu.course_id = ${BigInt(courseId)})`;
 
 exports.getUnits = async (req, res) => {
   try {
@@ -1197,10 +1236,12 @@ exports.getUnitPermanentDeleteImpact = async (req, res) => {
 // Entity-level archive/permanent-delete lives in /admin/lessons (the library).
 // ══════════════════════════════════════════════════════════════════════════════
 
+// Same BigInt fix as courseOrderLiteral/courseMembershipLiteral above —
+// unit_id is a 19-digit snowflake BIGINT, past Number.MAX_SAFE_INTEGER.
 const unitOrderLiteral = (unitId) =>
-  `(SELECT ul.order_index FROM unit_lessons ul WHERE ul.unit_id = ${Number(unitId)} AND ul.lesson_id = "Lesson"."lesson_id" LIMIT 1)`;
+  `(SELECT ul.order_index FROM unit_lessons ul WHERE ul.unit_id = ${BigInt(unitId)} AND ul.lesson_id = "Lesson"."lesson_id" LIMIT 1)`;
 const unitMembershipLiteral = (unitId) =>
-  `(SELECT ul.lesson_id FROM unit_lessons ul WHERE ul.unit_id = ${Number(unitId)})`;
+  `(SELECT ul.lesson_id FROM unit_lessons ul WHERE ul.unit_id = ${BigInt(unitId)})`;
 
 exports.getLessons = async (req, res) => {
   try {

controllers/admin/units.controller.js

@@ -73,8 +73,9 @@ const UNIT_LIST_COMPUTED = [
   },
   {
     key: "course_count",
-    label: "Used in courses",
+    label: "Affiliated",
     type: "number",
+    order: 2, // 1: Title, 2: Affiliated, 3: Subscription, 4: Duration — see units.mdl.js
     literal: `(
       SELECT CAST(COUNT(*) AS INTEGER)
       FROM course_units cu