Comparisons anchored on TigerBeetle, the Apache-2.0 financial transactions database: against PostgreSQL as a ledger store and against the Blnk ledger service.
Whether to keep balances in PostgreSQL tables or move transfers to TigerBeetle: fixed double-entry schema against flexible SQL, contention on hot accounts, replication and HA, and the TigerBeetle plus PostgreSQL pattern.
A purpose-built transactions database against a ledger service on PostgreSQL with balances, inflight transactions, reconciliation and identities: what each gives you out of the box, what you still build, and operating effort.
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