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I used this as a guide, but made some changes to it: https://github.com/Kozea/Radicale/issues/779
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InfluxDB
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I did something very similar years ago in Baikal and its been running mostly intact since then with a few version upgrades here and there. PowerShell to get Exchange GAL contacts in CSV. Perl (because years ago I knew Perl better than PowerShell) to convert CSV to vCard. Perl to load vCard into Baikal directly though database write. 300 people with mobile devices use 1 read-only CardDAV account pushed out by our MDM and magically get the entire GAL on their phone. The ONLY issue is that once in a while a phone won't realize the CardDAV DB has updated and you have to go in and turn the account off/on in the phone settings to get it to refresh.