Depends on D14577
SLPDB is well beyond its useful life. While it returned good results for the limited use case of getting token balances at addresses by blockheight, the airdrop feature was nice to have.
Unfortunately SLPDB has started returning haunted results (conflicting reports of balances that look off mixed with obviously wrong data). Occasionally no results are returned, though the server still returns a good status.
SLPDB was always slated for deprecation. Chronik does not yet support its full feature set, but it will be up to us to decide which features are indeed critical to revive and build out.
The Airdrop feature of Cashtab, like encrypted msgs, is high complexity and low use.