htable: track when records were successfully loaded from database

- write back only in such case

src/modules/htable/ht_api.c

@@ -1099,7 +1099,7 @@ int ht_db_sync_tables(void)
 	ht = _ht_root;
 	while(ht)
 	{
-		if(ht->dbtable.len>0 && ht->dbmode!=0 && ht->ncols==0)
+		if(ht->dbtable.len>0 && ht->dbmode!=0 && ht->dbload!=0 && ht->ncols==0)
 		{
 			LM_DBG("sync db table [%.*s] from ht [%.*s]\n",
 					ht->dbtable.len, ht->dbtable.s,

src/modules/htable/ht_api.h

@@ -63,6 +63,7 @@ typedef struct _ht
 	unsigned int htexpire;
 	str dbtable;
 	int dbmode;
+	int dbload;
 	int ncols;
 	str scols[HT_MAX_COLS];
 	char pack[4];

src/modules/htable/ht_db.c

@@ -211,6 +211,7 @@ int ht_db_load_table(ht_t *ht, str *dbtable, int mode)
 		LM_ERR("failed to use_table\n");
 		return -1;
 	}
+	ht->dbload = 0;
 	if(ht->ncols>0) {
 		db_ord = &ht->scols[0];
 		for(c=0; c<ht->ncols; c++) {
@@ -527,6 +528,7 @@ int ht_db_load_table(ht_t *ht, str *dbtable, int mode)
 
 	ht_dbf.free_result(ht_db_con, db_res);
 	LM_DBG("loaded %d values in hash table\n", cnt);
+	ht->dbload = 1;
 
 	return 0;
 error:

src/modules/htable/htable.c

@@ -2053,6 +2053,8 @@ static void htable_rpc_reload(rpc_t* rpc, void* c)
 		ht_slot_unlock(ht, i);
 		nht.entries[i].first = first;
 	}
+	ht->dbload = 1;
+
 	/* free old entries */
 	for(i=0; i<nht.htsize; i++)
 	{