### Description

Configured the location module to load the expires column as a datetime instead of an integer but db_redis ignored the parameter and loaded the data with the default schema. As of today, the default schema has last_modified and expires columns as integers but stores them as timestamps.

``` id/int,ruid/string,username/string,domain/string,contact/string,received/string,path/string,expires/**int**,q/double,callid/string,cseq/int,last_modified/**int**,flags/int,cflags/int,user_agent/string,socket/string,methods/int,instance/string,reg_id/int,server_id/int,connection_id/int,keepalive/int,partition/int, 9 ```

### Troubleshooting

#### Reproduction

Use db_redis as backend and use the location module.

While handling INVITE:

if (!lookup("location")) { sl_send_reply("404", "User Not Found"); return; }

While handling REGISTER:

if (!save("location")) sl_reply_error();

#### Debugging Data

#### Log Messages

``` 8(34) ERROR: <core> [db_ut.c:92]: db_str2int(): Unexpected characters: [-04-01 07:17:14] 8(34) ERROR: <core> [db_val.c:76]: db_str2val(): error while converting integer value from string 8(34) ERROR: db_redis [redis_dbase.c:1062]: db_redis_convert_row(): Failed to convert redis column 'expires' to db value 8(34) ERROR: db_redis [redis_dbase.c:1231]: db_redis_perform_query(): Failed to convert redis reply for row 8(34) ERROR: db_redis [redis_dbase.c:1243]: db_redis_perform_query(): failed to perform the query 8(34) ERROR: db_redis [redis_dbase.c:1829]: db_redis_query(): failed to do the query 8(34) ERROR: usrloc [udomain.c:641]: db_load_urecord(): db_query failed ```

#### SIP Traffic

<!-- If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

``` (paste your sip traffic here) ```

### Possible Solutions

I patched the default schema with the following and it worked.

``` id/int,ruid/string,username/string,domain/string,contact/string,received/string,path/string,expires/**timestamp**,q/double,callid/string,cseq/int,last_modified/**timestamp**,flags/int,cflags/int,user_agent/string,socket/string,methods/int,instance/string,reg_id/int,server_id/int,connection_id/int,keepalive/int,partition/int, 9 ```

### Additional Information

* **Kamailio Version** - output of `kamailio -v`

``` version: kamailio 5.2.2 (x86_64/linux) flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144 MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: unknown compiled with gcc 6.3.0 ```

* **Operating System**:

<!-- Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...; Kernel details (output of `uname -a`) -->

``` Linux gke-production-cluster-default-pool-fb621121-qz3r 4.14.65+ #1 SMP Thu Oct 25 10:42:50 PDT 2018 x86_64 GNU/Linux ```