Please describe the problem.

$> git show git-annex
commit 318da631abbd7562de52dd4e51fdcc6df01c3622 (git-annex)
Author: Yaroslav Halchenko <debian@onerussian.com>
Date:   Fri Mar 28 07:27:33 2025 -0400

    [DATALAD RUNCMD] Manually trying to fixup one URL so it uses yt-dlp

    refs:
    - https://git-annex.branchable.com/bugs/tries_to_download_a_.mkv_video_without_yt-dlp/
    - https://git-annex.branchable.com/todo/yt-dlp__58___parse__47__handle___40__error__41_____34__Video_unavailable__34__/

    note that key also does not have yt: prefix as those which would be going through yt:
    but I think this is irrelevant here for our purposes. Just something to remember to not rely on

    Note: it was not actually "datalad run" committed due to
            https://git-annex.branchable.com/bugs/git-annex_should_not___34__annex__34___in_git-annex_branch/?updated

    I just reused the record etc

    === Do not change lines below ===
    {
     "chain": [],
     "cmd": "sed -i -e 's,^[0-9]*s\\(.*\\)https:,1743156234s\\1yt:https:,g' 'e9f/464/URL-s955950--https&c%%www.youtube.com%watch,63v,61hWwtFQLntbE.log.web'",
     "exit": 0,
     "extra_inputs": [],
     "inputs": [],
     "outputs": [],
     "pwd": "."
    }
    ^^^ Do not change lines above ^^^

diff --git a/e9f/464/URL-s955950--https&c%%www.youtube.com%watch,63v,61hWwtFQLntbE.log.web b/e9f/464/URL-s955950--https&c%%www.youtube.com%watch,63v,61hWwtFQLntbE.log.web
index 331362218..e63cffe5d 100644
--- a/e9f/464/URL-s955950--https&c%%www.youtube.com%watch,63v,61hWwtFQLntbE.log.web
+++ b/e9f/464/URL-s955950--https&c%%www.youtube.com%watch,63v,61hWwtFQLntbE.log.web
@@ -1 +1 @@
-1742983318s 1 https://www.youtube.com/watch?v=hWwtFQLntbE
+1743156234s 1 yt:https://www.youtube.com/watch?v=hWwtFQLntbE

but then git annex get would still fail, since verification fails, likely due to the key also having size in it. So I had to migrate to URL backend without size, as the bible teaches us:

$> git annex help migrate   
...
              One use of this option is to convert URL keys that were added by git-annex addurl --fast to ones that would have been added if that command was run with the --relaxed option. Eg:

               git-annex migrate --remove-size --backend=URL somefile

but no luck -- nothing is done for that file/key:

$> git status
On branch master
Your branch is ahead of 'origin/master' by 1 commit.
  (use "git push" to publish your local commits)

nothing to commit, working tree clean

$> ls -ld Чат_рулетка/2025-03-26-_Что_у_россиянок_в_головах____чат_рулетка.mkv
lrwxrwxrwx 1 yoh datalad 151 Mar 26 06:01 Чат_рулетка/2025-03-26-_Что_у_россиянок_в_головах____чат_рулетка.mkv -> ../.git/annex/objects/p9/Km/URL-s955950--https&c%%www.youtube.com%watch,63v,61hWwtFQLntbE/URL-s955950--https&c%%www.youtube.com%watch,63v,61hWwtFQLntbE

$> git annex --debug migrate --remove-size --backend=URL Чат_рулетка/2025-03-26-_Что_у_россиянок_в_головах____чат_рулетка.mkv
[2025-03-28 08:09:40.732628384] (Utility.Process) process [1262316] read: git ["--git-dir=.git","--work-tree=.","--literal-pathspecs","-c","annex.debug=true","ls-files","--stage","-z","--error-unmatch","--","\1063\1072\1090_\1088\1091\1083\1077\1090\1082\1072/2025-03-26-_\1063\1090\1086_\1091_\1088\1086\1089\1089\1080\1103\1085\1086\1082_\1074_\1075\1086\1083\1086\1074\1072\1093____\1095\1072\1090_\1088\1091\1083\1077\1090\1082\1072.mkv"]
[2025-03-28 08:09:40.733804218] (Utility.Process) process [1262317] chat: git ["--git-dir=.git","--work-tree=.","--literal-pathspecs","-c","annex.debug=true","cat-file","--batch-check=%(objectname) %(objecttype) %(objectsize)","--buffer"]
[2025-03-28 08:09:40.73435116] (Utility.Process) process [1262318] chat: git ["--git-dir=.git","--work-tree=.","--literal-pathspecs","-c","annex.debug=true","cat-file","--batch=%(objectname) %(objecttype) %(objectsize)","--buffer"]
[2025-03-28 08:09:40.738110034] (Utility.Process) process [1262318] done ExitSuccess
[2025-03-28 08:09:40.738197257] (Utility.Process) process [1262317] done ExitSuccess
[2025-03-28 08:09:40.738250358] (Utility.Process) process [1262316] done ExitSuccess
[2025-03-28 08:09:40.738775092] (Utility.Process) process [1262319] chat: git ["--git-dir=.git","--work-tree=.","--literal-pathspecs","-c","annex.debug=true","mktree","--missing","--batch","-z"]
[2025-03-28 08:09:40.739138127] (Utility.Process) process [1262320] chat: git ["--git-dir=.git","--work-tree=.","--literal-pathspecs","-c","annex.debug=true","mktree","--missing","--batch","-z"]
[2025-03-28 08:09:40.741935559] (Utility.Process) process [1262320] done ExitSuccess
[2025-03-28 08:09:40.74216456] (Utility.Process) process [1262319] done ExitSuccess

$> ls -ld Чат_рулетка/2025-03-26-_Что_у_россиянок_в_головах____чат_рулетка.mkv
lrwxrwxrwx 1 yoh datalad 151 Mar 26 06:01 Чат_рулетка/2025-03-26-_Что_у_россиянок_в_головах____чат_рулетка.mkv -> ../.git/annex/objects/p9/Km/URL-s955950--https&c%%www.youtube.com%watch,63v,61hWwtFQLntbE/URL-s955950--https&c%%www.youtube.com%watch,63v,61hWwtFQLntbE

$> git annex version | head -n 1
git-annex version: 10.20250115

fixed --Joey