# ParamDB

ParamDB is a key-value store that is time-aware. Multiple values can be assigned to each
key with unique validity ranges. It can be used to feed static information that varies
with time to templates or to serve news.

## Introduction

There are situations where you need data to slap into a template, and the data may vary
over time.

* Sending alert e-mails including contact information for the curent support techs.
* Seasonal greetings in automatically generated content.

ParamDB solves this problem by serving collections of keys over HTTP. A collection can
contain any number of keys, and a key can contain any number of values.

## Features

* Values are serialized, so arrays and objects can be stored and restored.
* Not intended to be running as a public service, so there is no authentication, for now.
* Last value that matches is returned.

### Future

* Metadata; store with key "meta" in value set post call, returned under a "meta" key in the
  result list.

## Using

### Store values

```json
POST /businessinfo
Content-Type: application/json

[
  {
    "openhours": {
      "value": "Mo-Fr 09-17, Sa-Su 12-02",
      "valid": {
        "from": "2024-10-01 00:00:00 +02:00",
        "until": "2024-10-07 23:59:59 +02:00"
      }
    }
  }
]
```

> [!NOTE]
> The only required key is `value`, and as there can only be one value without validity it will overwrite any existing value.

### Retrieve current values

```json
GET /businessinfo

{
  "openhours": "Mo-Fr 09-17, Sa-Su 10-01"
}
```

Query params:

* `date=` - override date (default is now) in the format "Y-m-d H:i:s P"

### Retrieve all values

```json
GET /businessinfo/all

{
  "openhours": [
    {
      "id": 13,
      "value": "Mo-Fr 09-17, Sa-Su 10-01"
    },
    {
      "id": 19,
      "value": "Mo-Fr 09-17, Sa-Su 12-02",
      "valid": {
        "from": "2024-10-01 00:00:00 +02:00",
        "until": "2024-10-07 23:59:59 +02:00"
      }
    ]
  }
}
```

Query params:

* `only=` - comma-separated list of keys to match

### Delete value

Delete by posting an array of value IDs and keys to delete.

```json
POST /businessinfo/delete
Content-Type: application/json

[ 19, "some.key" ]
```

### Update a value

Update by including an existing id with the set request.

```json
POST /businessinfo
Content-Type: application/json

{
  "openhours": {
    "id": 19,
    "value": "Mo-Fr 09-17, Sa-Su 12-03",
    "valid": {
      "from": "2024-10-01 00:00:00 +02:00",
      "until": "2024-10-07 23:59:59 +02:00"
    }
  }
}
```

### Delete a colleciton

Update by including an existing id with the set request.

```json
POST /businessinfo/purge
```