Data model generation with postgres and numeric types

Hi cube.js devs!

Using cube version 0.35.6, I am traying to generate a model for a postgres database using the playground. When generating model for tables with numeric types, ie:

```
onln=# \d acm_coin_in_statistics2
Table "public.acm_coin_in_statistics2"
Column | Type | Collation | Nullable | Default
-----------------------+--------------------------+-----------+----------+---------
device_id | numeric(10,0) | | not null |
game_id | numeric(5,0) | | not null |
statistics_date | timestamp with time zone | | not null |
hour_00 | numeric(10,0) | | |
hour_01 | numeric(10,0) | | |
...
Indexes:
"acm_coin_in_statistics2_pk" PRIMARY KEY, btree (device_id, game_id, statistics_date)
```

dimension for numeric values are generated as strings and primary key is not extracted correctly. If I use other data types (for example, integer, everithing works fine)

```
cubes:
- name: acm_coin_in_statistics
sql_table: public.acm_coin_in_statistics
data_source: default

joins: []

dimensions:
- name: game_id
sql: game_id
type: string

- name: device_id
sql: device_id
type: string

- name: statistics_date
sql: statistics_date
type: time

- name: hour_02
sql: hour_02
type: string

- name: hour_01
sql: hour_01
type: string
```

Is this the expected behaviour of the current version?

Thank you in advance!
Miguel