### 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
```
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