Capture posted date, value date when available, amount, currency, merchant, account, and a succinct description. Include source system, message hash, and parse method. These fields support trustworthy totals, accurate sorting, and reversible transformations when a lender changes message phrasing.
Duplicate messages happen during outages or forwards. Use idempotent keys from hashes, timestamps rounded to minutes, and amount plus merchant heuristics. Thread related messages to connect authorization, capture, and refund, so the timeline displays one coherent story instead of confusing fragments.
Start broad—groceries, transport, housing, fun, obligations—then refine after reviewing a month. Overly granular tags slow decisions and create maintenance debt. A few stable buckets reveal trends clearly, highlight tradeoffs, and keep the single screen free of fussy, rarely helpful microlabels.
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