Sync instead of download.

Updated Sync functions to perform proper synchronizations instead of pure downloads.
This means that if something is deleted on the server, it will be deleted on the client as well, instead of just left hanging.
The SyncProclamations function was also updated to perform this way, but while retaining the user's saved list.

internal/sync/sync.go

@@ -17,7 +17,6 @@ func SyncProclamations(database *gorm.DB) ([]db.Proclamation, error) {
 	fullURL := "https://portal.rhemawavetech.com/api/v1/proclamations"
 	logger.Debug("Syncronizing proclamations. URL: %s", fullURL)
 
-	// 1. Fetch from API
 	proclamations, err := netreq.GetJSON[db.Proclamation](fullURL)
 	if err != nil {
 		// If we're offline or API is down, we log it but don't crash.
@@ -27,17 +26,37 @@ func SyncProclamations(database *gorm.DB) ([]db.Proclamation, error) {
 	}
 	logger.Debug("Request Granted")
 
-	// 2. Data Transformation (Cleaning)
 	for i := range proclamations {
 		proclamations[i].Content = htmlRegex.ReplaceAllString(proclamations[i].Content, "")
 	}
 
-	// 3. Persist to Database
-	// Using Transaction ensures we don't end up with partial data if something fails
+	var storedProclamationSettings []db.Proclamation
+	database.Select("ID", "Selected").Find(&storedProclamationSettings)
+	// [ID]Selected
+	stash := make(map[string]bool)
+	for _, row := range storedProclamationSettings {
+		stash[row.ID] = row.Selected
+	}
+
+	for i := range proclamations {
+		proclamations[i].Selected = stash[proclamations[i].ID]
+	}
+
 	err = database.Transaction(func(tx *gorm.DB) error {
-		if err := tx.Omit("selected").Save(&proclamations).Error; err != nil {
+		// Clear the database
+		// Where "1 = 1" because batch Delete() requires a condition
+		// 'Where "1 = 1"' is like saying "while true be true" and tricks GORM into deleting everything
+		if err := tx.Where("1 = 1").Delete(db.Proclamation{}).Error; err != nil {
 			return err
 		}
+		// Then re-populate the database
+		if err := tx.Save(&proclamations).Error; err != nil {
+			return err
+		}
+		// Old sync code
+		// if err := tx.Omit("selected").Save(&proclamations).Error; err != nil {
+		// 	return err
+		// }
 		return nil
 	})
 
@@ -59,12 +78,22 @@ func SyncCategories(database *gorm.DB) ([]db.ProclamationCategory, error) {
 		logger.Error("Category sync failed, skipping update: %v", err)
 		return nil, err
 	}
+
 	err = database.Transaction(func(tx *gorm.DB) error {
+		if err := tx.Where("1 = 1").Delete(&db.ProclamationCategory{}).Error; err != nil {
+			return err
+		}
 		if err := tx.Save(&categories).Error; err != nil {
 			return err
 		}
 		return nil
 	})
+
+	if err != nil {
+		logger.Error("failed to sync proclamation categories: %v", err)
+		return nil, err
+	}
+
 	logger.Info("Successfully synced proclamation categories: %d", len(categories))
 	return categories, nil
 }