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build(016-load-concurrency-testing): T001-T002 setup + concurrency-guard migration

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Adds autocannon as a devDependency for the load-test tooling (T001), and the
shared schema migration T002 blocks: SLARun.version for optimistic
concurrency, plus two Postgres partial unique indexes
(assignments_one_current_per_ticket, escalation_events_ticket_rule_unique)
guarding against the assignment and escalation races research.md documents.
Applied directly to both the real dev DB and the throwaway test DB.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
saqib mir
2026-09-09 17:03:37 +05:30
co-authored by Claude Sonnet 5
parent 2fb5b7ac73
commit 1e332143bd
5 changed files with 615 additions and 0 deletions
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@@ -43,3 +43,6 @@ docker/minio/data/
.env
.env.*
!.env.example
# Load-test run reports — measurement artifacts, not fixtures (016-load-concurrency-testing)
tests/load/reports/
package-lock.json
Generated
+592
View File
@@ -36,12 +36,14 @@
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},
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@@ -5682,6 +6209,19 @@
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package.json
+2
View File
@@ -73,12 +73,14 @@
"zod": "^3.22.4"
},
"devDependencies": {
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prisma/migrations/20260909120000_add_concurrency_guards/migration.sql
+13
View File
@@ -0,0 +1,13 @@
-- AlterTable
ALTER TABLE "sla_runs" ADD COLUMN "version" INTEGER NOT NULL DEFAULT 0;
-- 016-load-concurrency-testing research.md §1: at most one current assignment per ticket,
-- enforced at the database level (a partial unique index, since Prisma's schema DSL cannot
-- express a WHERE-predicated unique constraint directly).
CREATE UNIQUE INDEX "assignments_one_current_per_ticket" ON "assignments"("ticketId") WHERE "isCurrent" = true;
-- 016-load-concurrency-testing research.md §3: a given escalation rule may fire at most once
-- per ticket over that ticket's lifetime (SLARun.ticketId is already @unique — no reopen-cycle
-- support, so a rule-triggered breach genuinely cannot recur for the same ticket). Manual
-- escalations (rule_id IS NULL) are excluded and remain repeatable.
CREATE UNIQUE INDEX "escalation_events_ticket_rule_unique" ON "escalation_events"("ticketId", "ruleId") WHERE "ruleId" IS NOT NULL;
prisma/schema.prisma
+5
View File
@@ -595,6 +595,11 @@ model SLARun {
completedAt DateTime?
// 016-load-concurrency-testing: optimistic-concurrency counter, identical convention to
// Ticket.version (003-ticketing) — guards pause/resume/complete/the breach sweep against
// racing each other and silently clobbering this run's state (research.md §2).
version Int @default(0)
@@index([status, resolutionDueAt])
@@index([status, firstResponseDueAt])
@@map("sla_runs")