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

tests/conftest.py

@@ -94,9 +94,7 @@ def mint():
 async def ledger():
     async def start_mint_init(ledger: Ledger):
         await migrate_databases(ledger.db, migrations_mint)
-        if settings.mint_cache_secrets:
-            await ledger.load_used_proofs()
-        await ledger.init_keysets()
+        await ledger.startup_ledger()
 
     if not settings.mint_database.startswith("postgres"):
         # clear sqlite database