Pagination links are missing from STAC API responses

[bmcandr]

Describe the bug
Pagination links are missing from STAC API responses from the /items and /search endpoints. This prevents clients from paging over results which has effects such as:

• Limiting Items returned by /items and /search endpoints to the first page of results. While the limit param can be passed to increase the number of Items returned per page, there is still a hard cap enforced (e.g., 1000 Items for /search endpoint).
• STAC Browser only displays first page of Items returned and it is not possible to advance to the next page (no links -> no next/prev buttons).

To reproduce
Steps to reproduce the behavior:

/items endpoints

1. Navigate to https://planetarycomputer.microsoft.com/api/stac/v1/collections/sentinel-2-l2a/items
2. Check links list

/search endpoint

# search sentinel-2-l2a collection for all Items with s2:mgrs_tile == '18STH' (there are thousands). 
# limit response to 1 Item/page so "next" link is expected.

curl -X GET "https://planetarycomputer.microsoft.com/api/stac/v1/search?collections=sentinel-2-l2a&query=%7B%22s2%3Amgrs_tile%22%3A%7B%22eq%22%3A%2218STH%22%7D%7D&limit=1" | jq '.links'

Response:

    [
        {
            "rel":"root",
            "type":"application/json",
            "href":"https://planetarycomputer.microsoft.com/api/stac/v1/"
        },
        {
            "rel":"self",
            "type":"application/json",
            "href":"https://planetarycomputer.microsoft.com/api/stac/v1/search?collections=sentinel-2-l2a&query=%7B%22s2%3Amgrs_tile%22%3A%7B%22eq%22%3A%2218STH%22%7D%7D&limit=1"
        }
    ]

Expected behavior
Pagination links should be present in responses.

Screenshots and shell session dumps

[bmcandr]

@ghidalgo3 🆘

[ghidalgo3]

Working on it!

[vincentsarago]

I believe the issue is also due to pgstac update and was fixed with stac-fastapi-pgstac 4.0 (https://github.com/stac-utils/stac-fastapi-pgstac/blob/main/CHANGES.md#fixed-11)

I'm going to work on a PR updating pcstac from stac-fastapi-pgstac 3.0.0a4 to 4.0