fix(mysql): route tenant data to physical shard tables

server/db/mysql/tenant_tables.go

@@ -9,19 +9,23 @@ import (
 	t "github.com/tinode/chat/server/store/types"
 )
 
-func tenantFriendshipsTable(t.TenantID) string {
-	return "im_friendships"
+func tenantTablePrefix(tenantID t.TenantID) string {
+	return fmt.Sprintf("im_%03d_", tenantID)
 }
 
-func tenantMessagesTable(t.TenantID) string {
-	return "im_messages"
+func tenantFriendshipsTable(tenantID t.TenantID) string {
+	return tenantTablePrefix(tenantID) + "friendships"
 }
 
-func tenantGroupMessagesTable(_ t.TenantID, month string) (string, bool) {
+func tenantMessagesTable(tenantID t.TenantID) string {
+	return tenantTablePrefix(tenantID) + "messages"
+}
+
+func tenantGroupMessagesTable(tenantID t.TenantID, month string) (string, bool) {
 	if !validShardMonth(month) {
 		return "", false
 	}
-	return fmt.Sprintf("im_group_messages_%s", month), true
+	return fmt.Sprintf("%sgroup_messages_%s", tenantTablePrefix(tenantID), month), true
 }
 
 func validShardMonth(month string) bool {