Order and data framework Result: one reconciled inventory fixture report per weekday, accounting for every raw input row without duplicate stored record_id values. Scope: Normal batch: 200 raw rows; peak: 400. Fixture check starts at 07:00; report desired by 09:00. Valid-row quantity depends on validation. Available systems: local Python 3.12 CSV worker, UTF-8 fixtures, PostgreSQL 16. Existing table: items(record_id integer primary key, label text). Capacity: developer has four hours for initial repair; operator has 30 minutes per weekday. Fixture-test budget: EUR 50. Machine runtime is unknown. Binding requirements: Map CSV id to database record_id. Validate before writing. Preserve valid rows; list invalid rows. Store each record_id at most once. Never overwrite a different existing label without operator review. Stop on HTTP 401. Require operator approval for every replay. Commit before writing the local checkpoint. No schema changes or vendor migration. Evidence: one controlled fixture evaluation failed at header mapping before database writing. No production execution or proposed repair has occurred. Assumptions: none used to claim capacity, runtime or acceptance. Unknowns: processing times, commit recovery time, review time, API latency, checkpoint reliability and concurrent database writers. Calculation: Available delivery window = 09:00 - 07:00 = 120 minutes per weekday. Feasibility remains unverified. The estimated 20 minutes/day of manual diagnosis is an estimate, not a measured saving opportunity. Production flow Proposed workflow; implementation and acceptance remain pending. Step Input Activity Result Role Resource Predecessor Successor Completion criterion A Fixture run request Start new attempt; disable automatic replay Attempt identifier and start evidence Operator Local worker Inputs available B New attempt recorded B Fictional API and bearer configuration Fetch CSV; stop on 401 Immutable local input snapshot or failure report Worker Python worker A C Complete UTF-8 input available C Input snapshot Check header and map id to record_id Accepted mapping or blocking error Worker Python worker B D Required columns available D Raw rows Assign row numbers; validate integer ID and nonempty label Valid candidates and rejected-row list Worker Python worker C E Every raw row represented E Valid candidates INSERT with ON CONFLICT (record_id) DO NOTHING and RETURNING; inspect existing label when not inserted Tentative inserted, identical-existing or conflicting classifications Worker PostgreSQL D F Every candidate classified or explicitly unresolved F Tentative transaction results Commit; resolve acknowledged or uncertain outcome Confirmed results or commit uncertainty Worker PostgreSQL E G Outcome documented G Commit evidence Write separate local checkpoint after confirmed commit Checkpoint evidence or checkpoint failure Worker Local storage F H Checkpoint status explicit H Row ledger and evidence Reconcile counts; write attempt report Complete or interrupted report Worker Local storage G, or any interruption I Every raw row accounted for I Report and errors Review; approve any replay Closure or recorded replay authorization Operator Report and local worker H New A if approved Decision recorded A through I are strictly sequential. No parallel execution is planned. Within D, independent validation checks may be implemented together without changing their precedence over writing. Database classifications remain tentative until commit is confirmed. On interruption, generate H using available evidence. Do not proceed through an uncertain commit as though it succeeded. Capacity calculation Step group Demand Available capacity Processing time Utilization / feasibility Initial repair and fixture verification Header fix, replay controls, recovery and reporting changes Four developer hours total Unknown Scope feasibility unverified Fetch and header checks One batch/day Machine capacity unknown Measure per batch Unknown Validation 200 rows normally; 400 peak Machine capacity unknown Measure per batch and row Unknown Database write and classification Valid candidates only Database capacity unknown Measure transaction duration Unknown Commit, checkpoint and report One attempt report Machine capacity unknown Measure each stage Unknown Operator review and replay decision One daily check plus exceptions 30 minutes/day Measure combined operator effort Unknown Calculation: Estimated current operator utilization = 20 minutes/day / 30 minutes/day * 100 = approximately 66.7%. That estimate leaves no proven allowance for additional review or replay work. Calculation: Peak input multiplier = 400 raw rows / 200 raw rows = 2. Do not infer that runtime doubles; measure both volumes. Developer tasks share the same four-hour allocation. Operator tasks share the same 30-minute daily allocation. Neither resource may be counted separately for overlapping tasks. Measure elapsed runtime from attempt start through report availability, including waits. Compare it with the 120-minute window. No deadline or budget feasibility claim is currently supported. Bottleneck and WIP analysis Observed blocker: header mapping fails before writing. This is a functional failure, not evidence of a processing-capacity bottleneck. After repair, measure fetch, validation, database, commit, checkpoint, reporting and operator-review durations. Use the largest sustained constraint on completed reports to identify the probable bottleneck. Proposed WIP control: Permit one active fixture attempt at a time. Keep one immutable input snapshot and its row ledger per attempt. Do not start a replay while the previous attempt’s transaction may still be active. Keep rejected and conflicting rows visible for review; never silently discard them. Retain pending and commit-outcome-unresolved rows in interrupted reports. Possible queues and blocking: Authentication failure blocks fetching. Invalid input waits for review but must not prevent other validated rows from being processed. Conflicting labels wait for operator review and remain unchanged. Uncertain commits block recovery until transaction state is understood. Failed checkpoint writing creates a recovery evidence gap after database work. Delayed operator approval blocks replay. Do not increase concurrency to overcome these waits before measuring its effect on database contention, report reconciliation and operator workload. Quality gates Transition Inspection object Criterion Method and scope Evidence Release role Reaction Fetch to parsing Response and input snapshot Successful fetch; valid UTF-8; no 401 continuation Check every response and complete file Fetch status and snapshot identity; redact authorization Worker Stop on 401 or incomplete fetch Header to validation Column names id and label available; id maps explicitly to record_id Check every file header Mapping result Worker Block writes; issue error report Validation to writing Every raw row Integer representable by PostgreSQL integer; nonempty label Validate every row Row number, accepted values or rejection reason Worker Reject invalid row; preserve valid candidates Database classification Every valid candidate Insert once, identify identical existing data, or flag different label INSERT conflict handling plus SELECT comparison Tentative row result Worker No UPDATE; flag conflict; stop on unexpected database failure Commit to checkpoint Transaction outcome Commit acknowledged or otherwise conclusively established Inspect commit response and recovery evidence Transaction outcome Worker Mark uncertainty; no success claim Report to closure Raw-row ledger and counts Every raw row appears exactly once in a report state Full reconciliation Attempt report Operator Withhold closure on gaps or unresolved outcomes Failure to replay Previous attempt and approval Recorded operator approval; previous transaction no longer active Review each replay request Approval and linked attempt identifiers Operator Do not replay without approval Use label equality without unrequested normalization. Whitespace-only label handling must be documented during repair; it must not silently alter stored labels. A conflict review does not authorize overwriting. Overwrite execution is outside this workflow. Controllable production plan Initial repair sequence: Correct header mapping and add preflight rejection before database writes. Disable automatic replays and require recorded operator authorization. Replace duplicate-sensitive plain INSERT behavior with non-overwriting conflict handling. Add row reconciliation, commit uncertainty handling and separate attempt reports. Run controlled fixtures covering normal input and failure cases. The developer’s four hours are a total limit, not measured implementation capacity. If required controls cannot be completed and verified within that limit, stop and request a scope or capacity decision. Daily pacing: Stage Start condition Target completion Dependency Buffer Start Accepted repair, available inputs and no active prior transaction 07:00 start Start release None quantified Fetch and validate New attempt recorded Within measured delivery window Successful fetch and mapping Unknown Write and commit Validation complete Before checkpoint and report Database available Unknown Report and review Results or interruption evidence available Report desired by 09:00 Reconciliation Unknown No buffer is assigned until runtime variation and operator availability are measured. If 09:00 cannot be met, present measured options: move the start earlier, extend the report target, add approved capacity, or explicitly reduce agreed scope while reporting excluded rows as pending. Do not hide exclusions or relax integrity requirements. Roles and handovers Developer: Executes initial repair and controlled fixture verification. Hands over changed behavior, test evidence, known limitations and operating instructions. Does not claim acceptance from implementation alone. Worker: Executes fetch, validation, database operations, checkpointing and reporting. Applies automatic gates defined by the approved workflow. Cannot authorize replay or overwrite. Operator: Starts fixture attempts, reviews reports and approves every replay. Acts as the stated error-review owner. Cannot change code. Formal authority to accept the repaired implementation is not explicitly supplied. Record acceptance before recurring use. Required handover package: Attempt identifier and linked predecessor attempt, if replayed. Input snapshot identity and raw-row count. Per-row results with raw row numbers and rejection or conflict reasons. Inserted, identical-existing, rejected and conflicting counts. Pending and commit-outcome-unresolved counts where applicable. Commit acknowledgement or uncertainty evidence. Checkpoint status. Start, finish and stage timestamps. Error summary and replay decision. No credentials in reports or logs. Disruption and escalation rules Disruption Detection Immediate action Escalation threshold Restart condition Missing or malformed input Fetch, decoding or header failure Block writes; retain evidence Any blocking input failure Correct input available; operator approves replay HTTP 401 Response status Stop immediately; disable further attempts First 401 Authentication issue resolved; operator approves replay Capacity loss Worker unavailable or operator time insufficient Preserve current state; prevent overlapping attempts Delivery target threatened or safe continuation impossible Resource restored and operator approval where replay is required Invalid row Validation failure List rejection; process other valid candidates Any systemic validation issue or inability to reconcile Corrected input if required; approved new attempt Different existing label Database comparison Leave stored row unchanged; list conflict Every conflict requires review Operator decision recorded; no overwrite assumed Delayed release Missing acceptance or replay approval Keep attempt blocked Approval delay threatens 09:00 Required approval recorded Timeout before commit Connection or transaction failure Stop; establish whether rollback occurred Any uncertain transaction state Prior transaction ended; operator approves replay Timeout during or after commit Missing commit acknowledgement Mark affected rows unresolved; inspect database and transaction evidence Any uncertain commit outcome Prior transaction ended; evidence retained; operator approves replay Checkpoint failure Local write error after confirmed commit Retain commit evidence; report checkpoint failure First failure Local storage restored; any replay approved Worker or database failure Exceptions or loss of connectivity Stop safely; retain snapshot and ledger; rollback if possible First failure preventing safe continuation System restored and replay approved Database presence alone cannot prove which attempt originally inserted a row. Recovery may confirm current state while preserving historical attribution uncertainty. If the prior transaction cannot be shown to have ended, do not restart against it. Control board Indicator Calculation Source Rhythm Target or warning logic Responsible Raw-row reconciliation Raw rows minus sum of report states, in rows Snapshot and ledger Every report Must equal zero Worker; operator reviews Stored-state reconciliation Valid candidates with verified database outcomes, in rows Database checks and ledger Every attempt Warn on pending or unresolved outcomes Worker Report throughput time Report timestamp minus attempt start, in minutes Timestamps Every attempt Compare with 120-minute window Operator On-time report delivery Reports available by 09:00 / scheduled weekday reports * 100, in percent Schedule and reports Daily; summarize periodically Desired delivery by 09:00; no percentage target supplied Operator WIP Number of active attempts, in attempts Attempt evidence Start and interruption Proposed maximum one Operator Unresolved rows Pending rows plus commit-outcome-unresolved rows, in rows Ledger Every report Zero required for success claim Worker Replay count Approved replay attempts per batch, in attempts/batch Approval records Every batch Any replay requires approval; no numeric target supplied Operator Operator effort Total review, diagnosis and approval time, in minutes/day Operator time log Daily Available capacity 30 minutes/day Operator Completed-attempt calculation: Raw rows = inserted + identical-existing + rejected + conflicting, all in rows. Interrupted-attempt calculation: Raw rows = inserted + identical-existing + rejected + conflicting + pending + commit-outcome-unresolved, all in rows. Apply these equations to each attempt independently. Never add replay reports together as distinct business records. First-pass yield is omitted because an agreed acceptance definition is missing. Replay count records recovery activity without pretending that every replay is row rework. Start release Recommendation: NO-GO for recurring execution of the current worker. Reasons: Current headers cause a known failure. Automatic replay conflicts with required operator approval. Duplicate handling, interrupted reconciliation and uncertain commit recovery require repair and verification. Runtime and deadline feasibility are unmeasured. No repair has been executed or accepted in this scenario. First three executable steps: Developer disables automatic replay and adds explicit id-to-record_id header mapping with preflight checks. Developer implements non-overwriting database classification and an attempt ledger covering all raw rows and interrupted states. Developer runs controlled fixtures for invalid rows, repeated IDs, identical and conflicting existing rows, HTTP 401, commit timeouts and checkpoint failure; operator reviews evidence before approving any replay. Necessary measurements: Stage and total runtime at 200 and 400 raw rows. Operator review and recovery effort. Time to establish transaction termination after timeout. Actual fixture-test cost against EUR 50. Repair effort against four developer hours. Next control time: after the initial repair and controlled fixture evaluation, before authorizing recurring checks. For an accepted weekday run, review again by 09:00. Required documents: repair summary, operating instructions, fixture inputs, per-attempt reconciled reports, failure and commit evidence, timing and cost measurements, acceptance decision and replay approvals. Release may become GO-WITH-CONDITIONS when integrity and replay controls pass but delivery timing remains unverified. It must not imply successful row reconciliation while pending or unresolved rows remain.