Field in a no-SQL, fast response data store (Mongo, DynamoDB, etc).
Transaction table for long term historic storage.
Yes, you will need logic to keep the column up to day based on the transaction table.
How do banks do it, deep down inside nearly every single back is a room that contains a bunch of IBM AS/400, AS/800, or similar. These massive cabinet sized Unix machines run COBOL/FORTRAN. Every other tech is an abstraction of this system
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Field in a no-SQL, fast response data store (Mongo, DynamoDB, etc).
Transaction table for long term historic storage.
Yes, you will need logic to keep the column up to day based on the transaction table.
How do banks do it, deep down inside nearly every single back is a room that contains a bunch of IBM AS/400, AS/800, or similar. These massive cabinet sized Unix machines run COBOL/FORTRAN. Every other tech is an abstraction of this system