Mint: Recover pending melts at startup (#499)

* wip works with fakewallet

* startup refactor

* add tests

* regtest tests for pending melts

* wip CLN

* remove db migration

* remove foreign key relation to keyset id

* fix: get_promise from db and restore DLEQs

* test: check for keyset not found error

* fix migrations

* lower-case all db column names

* add more tests for regtest

* simlate failure for lightning

* test wallet spent state with hodl invoices

* retry

* regtest with postgres

* retry postgres

* add sleeps

* longer sleep on github

* more sleep for github sigh

* increase sleep ffs

* add sleep loop

* try something

* do not pay with wallet but with ledger

* fix lnbits pending state

* fix pipeline to use fake admin from docker

cashu/wallet/cli/cli.py

@@ -247,7 +247,7 @@ async def invoice(ctx: Context, amount: float, id: str, split: int, no_check: bo
     await wallet.load_mint()
     await print_balance(ctx)
     amount = int(amount * 100) if wallet.unit == Unit.usd else int(amount)
-    print(f"Requesting invoice for {wallet.unit.str(amount)} {wallet.unit}.")
+    print(f"Requesting invoice for {wallet.unit.str(amount)}.")
     # in case the user wants a specific split, we create a list of amounts
     optional_split = None
     if split: