Contract detection based on Hibiscus transactions

[janrieke]

Detect likely regular payments in past Hibiscus transactions

[christian-weiss]

I would install the ContractManager if it is able to detect contracts based on transaction analysis.

Automatic detection is hard, if:

• there is not yet a transaction for that contract or only one
• the contract is paided yearly (requires at least 2 years of data for analysis)
• the payed amount differs between payments (basic charge + usage fee)

Options to improve the sitution:

• DISTINCT by account owner name, IBAN/accountNo, BIC/BLZ and count number of transcation >1
• check if there are at least 1 transaction per month (ignoring exact date) = monthly payments
• check if there is at least 1 trasaction per quarter (ignore exact date) = quarterly payments
• check if there is at least one payment in the same month each year
• pick the most likly interval

I do not think we need to support more intervals (in the beginning).

If you want to detect contracts even if there is only a single transaction then i think we need a community shared and community managed database of known "contract givers" listing IBAN/accountNumber, BIC/BLZ and account owner name.

I would love to see this feature in next release.

I am not sure how this issue here relates to:
#2
#6
#18

Maybe the others are dublicates - if not: please add more description.