feat: complete shared database tenant sharding

server/db/mysql/tenant_tables.go

@@ -5,10 +5,18 @@ package mysql
 
 import (
 	"fmt"
+	"strings"
 
 	t "github.com/tinode/chat/server/store/types"
 )
 
+func tenantShardSQL(tenantID t.TenantID, query string) string {
+	query = strings.ReplaceAll(query, "im_topics", tenantTopicsTable(tenantID))
+	query = strings.ReplaceAll(query, "im_group_members", tenantGroupMembersTable(tenantID))
+	query = strings.ReplaceAll(query, "im_subscriptions", tenantSubscriptionsTable(tenantID))
+	return strings.ReplaceAll(query, "im_system_notifications", tenantSystemNotificationsTable(tenantID))
+}
+
 func tenantTablePrefix(tenantID t.TenantID) string {
 	return fmt.Sprintf("im_%03d_", tenantID)
 }
@@ -21,6 +29,22 @@ func tenantMessagesTable(tenantID t.TenantID) string {
 	return tenantTablePrefix(tenantID) + "messages"
 }
 
+func tenantTopicsTable(tenantID t.TenantID) string {
+	return tenantTablePrefix(tenantID) + "topics"
+}
+
+func tenantGroupMembersTable(tenantID t.TenantID) string {
+	return tenantTablePrefix(tenantID) + "group_members"
+}
+
+func tenantSubscriptionsTable(tenantID t.TenantID) string {
+	return tenantTablePrefix(tenantID) + "subscriptions"
+}
+
+func tenantSystemNotificationsTable(tenantID t.TenantID) string {
+	return tenantTablePrefix(tenantID) + "system_notifications"
+}
+
 func tenantGroupMessagesTable(tenantID t.TenantID, month string) (string, bool) {
 	if !validShardMonth(month) {
 		return "", false