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When two ",[481,482,483],"code",{},"scheduled_changes"," rows share the same ",[481,486,487],{},"changing_at",", ",[481,490,491],{},"ProcessScheduledChangesJob"," processes them in the order returned by ",[481,494,495],{},"ScheduledChangeService::getDuePendingScheduledChangesForTenant",". That query previously ordered only by ",[481,498,487],{},", so same-instant rows had non-deterministic (typically insertion\u002Fid) order.",[450,501,502,503,506],{},"If a CREATE_UPDATE (e.g. a new promotion or a standard-rate change) runs before a DELETE (e.g. ending the previous promotion) at that instant, rates can briefly violate ",[481,504,505],{},"standard_rate \u003C promotional_rate \u003C 100",", and storefront\u002Forder paths can observe the wrong rate.",[466,508,510],{"id":509},"decision-drivers","Decision Drivers",[512,513,514,518,524,527],"ul",{},[515,516,517],"li",{},"Allow touching boundaries without a forced 1-minute gap",[515,519,520,521,523],{},"Guarantee deterministic processing when ",[481,522,487],{}," values coincide",[515,525,526],{},"Prefer a query-level fix over broadening rate-conflict validation buffers",[515,528,529],{},"Keep the job itself a thin runner over the service's ordered collection",[466,531,533],{"id":532},"considered-options","Considered Options",[535,536,538,539,541],"h3",{"id":537},"order-by-changing_at-then-delete-before-create_update","Order by ",[481,540,487],{},", then DELETE before CREATE_UPDATE",[450,543,544,545,548],{},"Secondary sort on ",[481,546,547],{},"operation"," so deletes\u002Freverts run before creates\u002Fupdates for the same timestamp.",[535,550,552],{"id":551},"enforce-a-minimum-temporal-gap-in-rate-conflict-validation","Enforce a minimum temporal gap in rate-conflict validation",[450,554,555],{},"Reject schedules that share an instant (e.g. require ≥ 1 minute separation).",[535,557,559],{"id":558},"sort-in-php-after-fetch","Sort in PHP after fetch",[450,561,562,563,565],{},"Leave SQL unordered beyond ",[481,564,487],{},"; reorder the collection in the job or service in memory.",[466,567,569],{"id":568},"decision-outcome","Decision Outcome",[450,571,572,573,577],{},"Chosen: ",[453,574,538,575,541],{},[481,576,487],{},".",[450,579,580],{},"Justification: Touching instants are a desired product rule. Ordering deletes first at the query boundary makes the runner safe without inventing an artificial gap, and keeps a single source of truth for processing order.",[450,582,583,584,587,588,577],{},"Implementation: ",[481,585,586],{},"orderByRaw(\"CASE operation WHEN 'delete' THEN 0 WHEN 'create\u002Fupdate' THEN 1 ELSE 2 END\")"," after ",[481,589,590],{},"orderBy('changing_at')",[466,592,594],{"id":593},"consequences","Consequences",[535,596,598],{"id":597},"positive","Positive",[512,600,601,604,607],{},[515,602,603],{},"Same-instant promo end + promo start, and promo end + standard-rate change, process safely",[515,605,606],{},"Rate conflict guards can treat exclusive-end \u002F inclusive-start (touch) as allowed",[515,608,609],{},"Job characterisation remains \"process in service return order\"; service owns ordering",[535,611,613],{"id":612},"negative","Negative",[512,615,616,627],{},[515,617,618,619,622,623,626],{},"Ordering knowledge lives in SQL ",[481,620,621],{},"CASE"," and must stay aligned with ",[481,624,625],{},"Operation"," enum values",[515,628,629,630,632],{},"Unknown future ",[481,631,547],{}," values sort last (ELSE 2) until the CASE is extended",[535,634,636],{"id":635},"neutral","Neutral",[512,638,639],{},[515,640,641],{},"Legacy discount\u002Fcashback DELETE support remains until those processors\u002Fendpoints are removed (see ADR 0003)",{"title":643,"searchDepth":644,"depth":644,"links":645},"",3,[646,648,649,650,656,657],{"id":468,"depth":647,"text":469},2,{"id":475,"depth":647,"text":476},{"id":509,"depth":647,"text":510},{"id":532,"depth":647,"text":533,"children":651},[652,654,655],{"id":537,"depth":644,"text":653},"Order by changing_at, then DELETE before CREATE_UPDATE",{"id":551,"depth":644,"text":552},{"id":558,"depth":644,"text":559},{"id":568,"depth":647,"text":569},{"id":593,"depth":647,"text":594,"children":658},[659,660,661],{"id":597,"depth":644,"text":598},{"id":612,"depth":644,"text":613},{"id":635,"depth":644,"text":636},{},"Date: 06-08-2026\nAuthor(s): Jayden Vicarey\nSource: EM-3691 rate-guard team discussion","md",{},{"title":234,"description":663},"vsRikRDiqWaINx-9ls0ZfY7qidRsuSCVqe3IhcacddE",[669,670],{"title":230,"path":231,"stem":232,"children":-1},{"title":238,"path":239,"stem":240,"children":-1},1789777548409]