Migrate the daily posting pipeline (CBTRN01C, CBTRN02C) to com.carddemo.batch.posting

[devanshi-gpta]

Summary

Migrates the daily posting pipeline — CBTRN01C (verification pass) and CBTRN02C (posting, JCL POSTTRAN + DALYREJS) — into com.carddemo.batch.posting. Rules live in @Services; DailyPostingJobConfig only wires them into Spring Batch (dailyTransactionVerificationJob, postTransactionJob; DALYTRAN read ordered by DALYTRAN-ID, rejects to a flat file at carddemo.batch.posting.reject-file). No shared entity/repository/pom changes.

Behavioral details worth knowing, all taken literally from 1500-* / 2000-*:

• Reject reasons are the COBOL codes and messages verbatim (PostingRejectReason): 100 INVALID CARD NUMBER FOUND, 101/109 ACCOUNT RECORD NOT FOUND, 102 OVERLIMIT TRANSACTION, 103 TRANSACTION RECEIVED AFTER ACCT EXPIRATION.
• 1500-B-LOOKUP-ACCT evaluates the limit check then the expiry check into the same field, so a transaction that is both over limit and past expiry is rejected as 103 — reproduced by overwriting reason, not by short-circuiting.
• Limit test is ACCT-CREDIT-LIMIT >= (cycCredit - cycDebit + amt), i.e. exactly-on-the-limit is accepted; expiry test is an alphanumeric compare of ACCT-EXPIRAION-DATE against DALYTRAN-ORIG-TS(1:10), so the expiration date itself is accepted.
• 2800-UPDATE-ACCOUNT-REC adds the signed amount: currBal += amt, then amt >= 0 ? cycCredit += amt : cycDebit += amt (a negative amount therefore decreases the cycle debit). Update order is preserved: TCATBAL (create-or-add) → ACCOUNT → TRANSACT.
• A failing account REWRITE only records reason 109 (PostingResult.getAccountUpdateFailure()); the transaction is still written to TRANSACT and no reject record is produced, as in the COBOL.
• TransactionRejectRecord renders the 430-byte DALYREJS record (350-byte CVTRA06Y image + PIC 9(04) reason + PIC X(76) desc), including zoned-decimal overpunch for DALYTRAN-AMT; a test round-trips a real app/data/ASCII/dailytran.txt record through parse → render.
• TRAN-PROC-TS uses the Z-GET-DB2-FORMAT-TIMESTAMP layout EEEE-MM-DD-UU.MM.SS.HH0000, with an injectable Clock for tests.

mvn -B clean verify passes (28 tests; 18 new covering an accepted posting, each reject reason, the limit/expiry boundaries, the negative/zero-amount branches and reason 109).

Link to Devin session: https://app.devin.ai/sessions/4ac427d3381745c0acad80fdc924e933
Requested by: @devanshi-gpta

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