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### Description
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Explain what you did, what you expected to happen, and what actually happened.
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Just as in #1378, allowing nullable entries for SQL would be appreciated in acc `db_extra`
and acc `multi_leg_info`.
### Expected behavior
Empty/NULL values should be inserted with `NULL`. For example, I can't create a
`timestamp without time zone` to be used with multi-leg-accounting as follows.
```
modparam("acc", "multi_leg_info",
"leg_dst_user=$avp(leg_dst_user);"
"leg_dst_domain=$avp(leg_dst_domain);"
"leg_sip_code=$avp(leg_sip_code);"
"leg_time=$avp(leg_time);"
"leg_to_tag=$avp(leg_to_tag)")
$avp(leg_time)=$timef(%F %T)
```
#### Actual observed behavior
Emplty/NULL values are inserted with `''` which fails as `''` is invalid
input for a `timestamp without time zone` column.
#### Log Messages
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```
db_postgres [km_dbase.c:266]: db_postgres_submit_query(): 0x7f26f7fb6cc8 PQsendQuery
Error: ERROR: invalid input syntax for type timestamp: ""
```
#### SIP Traffic
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```
(paste your sip traffic here)
```
### Possible Solutions
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request with a improvement.
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### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
ersion: kamailio 5.4.1-8.gitd43872c11e.fc32.2 (x86_64/linux) 09fd6a
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST,
DNS_IP_HACK, 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, TLS_PTHREAD_MUTEX_SHARED
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: 09fd6a
compiled on 00:00:00 Oct 22 2020 with gcc 10.2.1
```
* **Operating System**:
<!--
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CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `uname -a`)
-->
```
Linux host 5.8.15-201.fc32.x86_64 #1 SMP Thu Oct 15 15:56:44 UTC 2020 x86_64 x86_64 x86_64
GNU/Linux
```
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