DéjàDéjà
PROTOCOL//ARCHITECTURAL PROOF

No magic.
Just math.

Déjà's Automated Chain of Custody turns incidents into deterministic evidence: what failed, why it recurred, and the exact fixes that resolved it.

>SECURE_TRANSMISSION//MODE:DETERMINISTIC_LOOKUP

The pipeline

Each phase emits structured metadata, so every match is explainable and reviewable.

01 // INGEST

Capture evidence

Ingest incidents, stack traces, and linked context (deploys, alerts, tickets).

02 // ANALYZE

Extract signal

Normalize traces, strip noise, and isolate the error's stable signature.

03 // FINGERPRINT

Stable identity

Generate a deterministic fingerprint that survives refactors and churn.

04 // MATCH

Evidence-backed fix

Match recurrence to prior proven PRs—complete with confidence and gates.

CURRENT_PHASE: INGEST
✓ incident + traces○ stable signature○ evidence-backed fix

Code-centric proof

> parse_trace() // emit fingerprint // match_fix()
NO_MAGIC: deterministic
12345678910111213141516171819202122232425
// 1) Normalize the trace to stable tokens
const normalized = stripNoise(trace)
  .keepFrames( ["src/api", "src/utils"])
  .collapseVendor();
// 2) Generate a deterministic fingerprint
const fp = sha256(
  serialize({
    error: normalized.errorType,
    message: normalized.messageTemplate,
    frames: normalized.stableFrames
  })
);
// 3) Match the fingerprint to prior fixes with evidence gates
const candidates = index.lookup(fp);
const verified = candidates
  .filter(c => c.gates.rate && c.gates.duration)
  .sortBy(c => c.confidence)
  .last();
return {
  fingerprint: fp,
  fix_pr: verified.pr,
  confidence: verified.confidence,
  evidence: verified.explain
};
VALIDATION GATES

Trust Engine

File Gate

Matches only if fix touched relevant files.

> GATE: file_gate // PASS: true

Rate Gate

Regression rate drops after fix window.

> GATE: rate_gate // PASS: true

Infra Gate

Rules out infra noise & deploy artifacts.

> GATE: infra_gate // PASS: true

Feature Flag Gate

Correlates fixes to rollout conditions.

> GATE: flag_gate // PASS: true

Duration Gate

Verifies fix stability over time.

> GATE: duration_gate // PASS: true

Privacy by design

Déjà is built for regulated environments. You decide what's ingested. The system can be deployed to meet strict perimeter requirements.

CODE_ACCESS:no source ingestion
DATA_MIN:tokens + fingerprints
RETENTION:configurable
>PERIMETER_POLICY: customer_defined//AUDIT_LOGS: enabled

Ready to deploy the engine?

Provision your Vault, connect a repo, and let the evidence accumulate.

Initialize Your Vault