course practice count fix

db/query/lms_courses.sql

@@ -55,13 +55,17 @@ SELECT
             INNER JOIN modules m ON l.module_id = m.id
         WHERE
             m.course_id = c.id) AS lesson_count,
+    -- Practices whose parent is the course only (lms_practices.course_id). Excludes
+    -- practices linked via module_id or lesson_id, even for modules/lessons in this course.
     (
         SELECT
             COUNT(*)::bigint
         FROM
             lms_practices p
         WHERE
-            p.course_id = c.id) AS practice_count
+            p.course_id = c.id
+            AND p.module_id IS NULL
+            AND p.lesson_id IS NULL) AS practice_count
 FROM
     courses c
 WHERE

gen/db/lms_courses.sql.go

@@ -145,13 +145,17 @@ SELECT
             INNER JOIN modules m ON l.module_id = m.id
         WHERE
             m.course_id = c.id) AS lesson_count,
+    -- Practices whose parent is the course only (lms_practices.course_id). Excludes
+    -- practices linked via module_id or lesson_id, even for modules/lessons in this course.
     (
         SELECT
             COUNT(*)::bigint
         FROM
             lms_practices p
         WHERE
-            p.course_id = c.id) AS practice_count
+            p.course_id = c.id
+            AND p.module_id IS NULL
+            AND p.lesson_id IS NULL) AS practice_count
 FROM
     courses c
 WHERE

internal/domain/course.go

@@ -23,7 +23,8 @@ type Course struct {
 	SortOrder   int        `json:"sort_order"`
 	CreatedAt   time.Time  `json:"created_at"`
 	UpdatedAt   *time.Time `json:"updated_at,omitempty"`
-	// Populated on list-by-program; practices with course_id set (direct course practice only).
+	// Populated on list-by-program. Practice count: lms_practices rows with course_id = course only
+	// (not practices attached to a module or lesson under this course).
 	ModuleCount   int `json:"module_count"`
 	LessonCount   int `json:"lesson_count"`
 	PracticeCount int `json:"practice_count"`