perf: keep default ledger queries on platform time indexes

internal/data/business/ledger.go

@@ -12,6 +12,30 @@ import (
 type ledgerRepo struct{ data Provider }
 
 func NewLedgerRepo(data Provider) business.LedgerRepo { return &ledgerRepo{data: data} }
+
+// Enumerating the stored platform codes lets MySQL use the leading column of
+// the time indexes even when the caller requests every platform. Read them
+// from the table so historical or newly imported codes remain in scope.
+func resolveLedgerSources(db *gorm.DB, table string, filter *business.LedgerFilter) error {
+	if len(filter.Sources) > 0 {
+		return nil
+	}
+	var sources []struct{ SourceDB *string }
+	if err := db.Table(table).Select("source_db").Distinct().Scan(&sources).Error; err != nil {
+		return business.ErrStorage
+	}
+	for _, source := range sources {
+		if source.SourceDB == nil {
+			// Legacy production columns are NOT NULL. Preserve unfiltered
+			// semantics if another supported storage layout contains NULL.
+			return nil
+		}
+	}
+	for _, source := range sources {
+		filter.Sources = append(filter.Sources, *source.SourceDB)
+	}
+	return nil
+}
 func ledgerBasePromotes(db *gorm.DB, scope business.LedgerScope, filter business.LedgerFilter, alias string) *gorm.DB {
 	q := db.Table("tab_promote " + alias)
 	if len(filter.Sources) > 0 {
@@ -149,6 +173,9 @@ func (r *ledgerRepo) Registrations(ctx context.Context, scope business.LedgerSco
 	if err != nil {
 		return nil, err
 	}
+	if err := resolveLedgerSources(db, "tab_user", &filter); err != nil {
+		return nil, err
+	}
 	q := registrationQuery(db, scope, filter, timeExpression)
 	if err := q.Count(&page.Total).Error; err != nil {
 		return nil, business.ErrStorage
@@ -274,6 +301,9 @@ func (r *ledgerRepo) Spends(ctx context.Context, scope business.LedgerScope, fil
 		page.TotalPayAmount = nil
 		return page, nil
 	}
+	if err := resolveLedgerSources(db, "tab_spend", &filter); err != nil {
+		return nil, err
+	}
 	q := spendQuery(db, scope, filter, false)
 	if err := q.Count(&page.Total).Error; err != nil {
 		return nil, business.ErrStorage