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Make sure that clangd-mine contains:

#!/bin/bash
exec /usr/local/bin/clangd  --query-driver=/usr/lib/ccache/g++-11 --header-insertion=never --background-index=0 "$@"

Now, to debug things like the cursed --background-index=0 above (that drove me mad, opening compile-commands.json from other folders (!), I had to switch to a much more bare-bones coc-settings.json setup:

{
  "clangd.path": "/usr/local/bin/clangd-mine",

  "inlayHint.display": false,

  "coc.preferences.previewAutoClose": false,
  "coc.preferences.previewSize": 35,

  "coc.preferences.rootPatterns": [
    "compile_commands.json",
    "compile_flags.txt",
    ".clangd"
  ],

  "diagnostic.checkCurrentLine": true,

  "clangd.arguments": [
    "--log=verbose",
    "--header-insertion=never",
    "--query-driver=/usr/lib/ccache/g++-11",
    "--background-index=0"
  ],

  "clangd.trace.server": "verbose"
}

or even more bare-bones:

{
  "clangd.arguments": [
    "--log=verbose",
    "--header-insertion=never",
    "--query-driver=/usr/lib/ccache/g++-11",
    "--background-index=0"
  ],
  "clangd.trace.server": "verbose",
  "coc.preferences.rootPatterns": [
    "compile_commands.json",
    "compile_flags.txt",
    ".clangd"
  ]
}

...and then, after launching vim, :CocInstall coc-clangd and :CocRestart, I was able to issue:

:CocCommand workspace.showOutput

...and choose clangd; that's where I saw that I was loading two compilation databases.