# PostgSail ERD
The Entity-Relationship Diagram (ERD) provides a graphical representation of database tables, columns, and inter-relationships. ERD can give sufficient information for the database administrator to follow when developing and maintaining the database.

## A global overview
Auto generated Mermaid diagram using [mermerd](https://github.com/KarnerTh/mermerd) and [MermaidJs](https://github.com/mermaid-js/mermaid).

[PostgSail SQL Schema](https://github.com/xbgmsharp/postgsail/tree/main/docs/ERD/postgsail.md "PostgSail SQL Schema")

## Further
There is 3 main schemas into the signalk database:
- API Schema:
  - tables
    - metrics
    - logbook
    - ...
  - functions
    - ...

- Auth Schema:
  - tables
    - accounts
    - vessels
    - ...
  - functions
    - ...

- Public Schema:
  - tables
    - app_settings
    - tpl_messages
    - ...
  - functions
    - ...

## Overview
- Insert data into table metadata from API using PostgREST
- Insert data into table metrics from API using PostgREST
- TimescaleDB Hypertable to store signalk metrics
- pgsql functions to generate logbook, stays, moorages
- CRON functions to process logbook, stays, moorages
- python functions for geo reverse and send notification via email and/or pushover
- Views statistics, timelapse, monitoring, logs
- Always store time in UTC

## Ingest flowchart
```mermaid
graph LR
    A[SignalK] -- HTTP POST --> B{PostgREST}
    B -- SQL --> C{PostgreSQL}
    C --> D((metadata trigger))
    C --> E((metrics trigger))
    D --> F{tbl.metadata}
    E --> G{tbl.metrics}
    E --> H{tbl.logs}
    E --> I{tbl.stays}
```

## pg_cron flowchart
```mermaid
flowchart TD
    A[pg_cron] --> B((cron_new_notification))
    A --> C((cron_pre_logbook))
    A --> D((cron_new_logbook))
    A --> E((cron_new_stay))
    A --> F((cron_monitor_offline))
    A --> G((cron_monitor_online))
    C --> K{Validate logbook details}
    D --> L{Update logbook details}
    E --> M{Update stay details}
    L --> N{Update Moorages details}
    M --> N{Update Moorages details}
    B --> O{Update account,vessel,otp}
    F --> P{Update metadata}
    G --> P
```
cron job are not process by default because if you don't have the correct settings set (SMTP, PushOver, Telegram), you might enter in a loop with error and you could be blocked or banned from the external services.

Therefor by default they are no active job as it require external configuration settings (SMTP, PushOver, Telegram).
To activate all cron.job run the following SQL command:
```sql
UPDATE cron.job SET active = True;
```
Be sure to review your postgsail settings via SQL in the table `app_settings`:
```sql
SELECT * FROM app_settings;
```

### How to bypass OTP for a local install?

You can skip the otp, add or update json key value to the account preference.
"email_valid": true

OTP is created and sent by email using a cron in postgres/cron/job

accounts are store in table signalk/auth/accounts

You should have an history in table signalk/public/process_queue
```sql
select * from public.process_queue;
```

### How to turn off signups

If you just want to use this as a standalone application and don't want people to be able to sign up for an account.

```SQL
revoke execute on function api.signup(text,text,text,text) to api_anonymous;
```
