Insert a new record:

curl https://opendata-staging.open1.eu/el/api/action/datastore_upsert \
-H"Authorization:$API_TOKEN" -d '
{
  "resource_id": "47fa6c5b-8d68-46b3-87e3-6e3e0b27a0b3",
  "method": "insert",
  "records: [
    {
      "only_latin_letters": null,
      "only_numbers": "45",
      "\u0391\u0392-": null
    }
  ]
}'

const resp = await fetch(`https://opendata-staging.open1.eu/el/api/action/datastore_upsert`, {
    method: 'POST',
    headers: {
        'content-type': 'application/json',
        authorization: API_TOKEN
    },
    body: JSON.stringify({
        resource_id: '47fa6c5b-8d68-46b3-87e3-6e3e0b27a0b3',
        method: "insert",
        records: [{
            only_numbers: "45",
            ΑΒ-: null,
            only_latin_letters: null
        }]
    })
await resp.json()

$json = @'
{
  "resource_id": "47fa6c5b-8d68-46b3-87e3-6e3e0b27a0b3",
  "method": "insert",
  "records": [
    {
      "only_latin_letters": null,
      "only_numbers": "45",
      "\u0391\u0392-": null
    }
  ]
}
'@
$response = Invoke-RestMethod https://opendata-staging.open1.eu/el/api/action/datastore_upsert`
  -Method Post -Body $json -Headers @{"Authorization"="$API_TOKEN"}
$response.result.records

from ckanapi import RemoteCKAN

ck = RemoteCKAN('https://opendata-staging.open1.eu/el/', apikey=API_TOKEN)
result = ck.action.datastore_upsert(
    resource_id="47fa6c5b-8d68-46b3-87e3-6e3e0b27a0b3",
    method="insert",
    records=[{
        "only_latin_letters": null,
        "only_numbers": "45",
        "\u0391\u0392-": null
    }]
)

library(httr2)

req <- request("https://opendata-staging.open1.eu/el/api/action/datastore_upsert")
result <- req %>% 
    req_headers(Authorization = API_TOKEN) %>% 
    req_body_json(list(
        resource_id = '47fa6c5b-8d68-46b3-87e3-6e3e0b27a0b3', 
        method = 'insert',
        records = list(list(
            only_numbers = "45",
            ΑΒ- = null,
            only_latin_letters = null))))
    req_perform %>% 
    resp_body_json

Update an existing record:

curl https://opendata-staging.open1.eu/el/api/action/datastore_upsert \
-H"Authorization:$API_TOKEN" -d '
{
  "resource_id": "47fa6c5b-8d68-46b3-87e3-6e3e0b27a0b3",
  "method": "update",
  "records: [
    {
      "_id": 2,
      "only_latin_letters": null,
      "only_numbers": "45",
      "\u0391\u0392-": null
    }
  ]
}'

const resp = await fetch(`https://opendata-staging.open1.eu/el/api/action/datastore_upsert`, {
    method: 'POST',
    headers: {
        'content-type': 'application/json',
        authorization: API_TOKEN
    },
    body: JSON.stringify({
        resource_id: '47fa6c5b-8d68-46b3-87e3-6e3e0b27a0b3',
        method: "update",
        records: [{
            _id: 2,
            only_numbers: "45",
            ΑΒ-: null,
            only_latin_letters: null
        }]
    })
await resp.json()

$json = @'
{
  "resource_id": "47fa6c5b-8d68-46b3-87e3-6e3e0b27a0b3",
  "method": "update",
  "records": [
    {
      "_id": 2,
      "only_latin_letters": null,
      "only_numbers": "45",
      "\u0391\u0392-": null
    }
  ]
}
'@
$response = Invoke-RestMethod https://opendata-staging.open1.eu/el/api/action/datastore_upsert`
  -Method Post -Body $json -Headers @{"Authorization"="$API_TOKEN"}
$response.result.records

from ckanapi import RemoteCKAN

ck = RemoteCKAN('https://opendata-staging.open1.eu/el/', apikey=API_TOKEN)
result = ck.action.datastore_upsert(
    resource_id="47fa6c5b-8d68-46b3-87e3-6e3e0b27a0b3",
    method="update",
    records=[{
        "_id": 2,
        "only_latin_letters": null,
        "only_numbers": "45",
        "\u0391\u0392-": null
    }]
)

library(httr2)

req <- request("https://opendata-staging.open1.eu/el/api/action/datastore_upsert")
result <- req %>% 
    req_headers(Authorization = API_TOKEN) %>% 
    req_body_json(list(
        resource_id = '47fa6c5b-8d68-46b3-87e3-6e3e0b27a0b3', 
        method = 'update',
        records = list(list(
            _id = 2,
            only_numbers = "45",
            ΑΒ- = null,
            only_latin_letters = null))))
    req_perform %>% 
    resp_body_json

"method" defaults to "upsert" i.e. records will be inserted or updated based on the primary key values passed

Delete a record:

curl https://opendata-staging.open1.eu/el/api/action/datastore_records_delete \
-H"Authorization:$API_TOKEN" -d '
{
  "resource_id": "47fa6c5b-8d68-46b3-87e3-6e3e0b27a0b3",
  "filters": {
    "_id": 1
  }
}'

const resp = await fetch(`https://opendata-staging.open1.eu/el/api/action/datastore_records_delete`, {
    method: 'POST',
    headers: {
        'content-type': 'application/json',
        authorization: API_TOKEN
    },
    body: JSON.stringify({
        resource_id: '47fa6c5b-8d68-46b3-87e3-6e3e0b27a0b3',
        filters: {
            _id: 1
        }
    })
await resp.json()

$json = @'
{
  "resource_id": "47fa6c5b-8d68-46b3-87e3-6e3e0b27a0b3",
  "filters": {
    "_id": 1
  }
}
'@
$response = Invoke-RestMethod https://opendata-staging.open1.eu/el/api/action/datastore_records_delete`
  -Method Post -Body $json -Headers @{"Authorization"="$API_TOKEN"}
$response.result.records

from ckanapi import RemoteCKAN

ck = RemoteCKAN('https://opendata-staging.open1.eu/el/', apikey=API_TOKEN)
result = ck.action.datastore_records_delete(
    resource_id="47fa6c5b-8d68-46b3-87e3-6e3e0b27a0b3",
    filters={
        "_id": 1
    }
)

library(httr2)

req <- request("https://opendata-staging.open1.eu/el/api/action/datastore_records_delete")
result <- req %>% 
    req_headers(Authorization = API_TOKEN) %>% 
    req_body_json(list(
        resource_id = '47fa6c5b-8d68-46b3-87e3-6e3e0b27a0b3', 
        filters = list(
            _id = 1)))
    req_perform %>% 
    resp_body_json