# Performance Tests

> **Calibration note**: no contracted SLAs exist anywhere in the codebase or `acceptance_criteria.md`. The thresholds below are **inferred starting points** anchored to the documented system properties. Step 15 (Performance Test) of the autodev existing-code flow will tune them against real targets. A test that fails the threshold is a *signal*, not a release-blocker, until the targets are contracted.

### NFT-PERF-LATENCY-01: Annotation create — p95 latency, small image

**Summary**: Sequential `POST /annotations` with a small frame stays under a per-call threshold at p95.
**Traces to**: implicit NFR; documented gap on AC-N-* (no contracted target)
**Metric**: end-to-end response latency in ms (consumer wall-clock from request start to body close).

**Preconditions**:
- SUT freshly started; warmup loop of 10 sequential calls discarded.
- Clean state; clean outbox; RabbitMQ stream consumer not connected (writes fan out via channel + outbox only).
- Single in-process consumer (no concurrent load).

**Steps**:

| Step | Consumer Action | Measurement |
|------|----------------|-------------|
| 1 | Warmup: 10× `POST /annotations` with `image_small.jpg` | discarded |
| 2 | Measure: 50× `POST /annotations` with `image_small.jpg`, sequential, single consumer | record latency per call |
| 3 | Compute p50, p95, p99 | summary stats |

**Pass criteria**: p95 ≤ 1500ms, p99 ≤ 3000ms (single-instance dev DB, no concurrent load).
**Duration**: ~2 minutes.

---

### NFT-PERF-LATENCY-02: Annotation create — large image

**Summary**: Same shape as -01 with a 7 MB image.
**Traces to**: same as -01.
**Metric**: end-to-end latency.

**Preconditions**: same as -01.

**Steps**:

| Step | Consumer Action | Measurement |
|------|----------------|-------------|
| 1 | Warmup: 5× `POST /annotations` with `image_large.JPG` | discarded |
| 2 | Measure: 20× `POST /annotations` with `image_large.JPG`, sequential | record latency per call |
| 3 | p50, p95, p99 | summary stats |

**Pass criteria**: p95 ≤ 5000ms, p99 ≤ 8000ms.
**Duration**: ~2 minutes.

---

### NFT-PERF-THROUGHPUT-01: Annotation create — sustained writes

**Summary**: 5-minute sustained `POST /annotations` traffic at 5 RPS does not degrade response latency.
**Metric**: response latency over time + total successful responses.

**Preconditions**: SUT warm; clean state; clean outbox; RabbitMQ broker reachable.

**Steps**:

| Step | Consumer Action | Measurement |
|------|----------------|-------------|
| 1 | Warmup: 30s at 5 RPS with `image_small.jpg` | discarded |
| 2 | Measure: 5 minutes at 5 RPS, 1 consumer | record per-second latency p50/p95 |
| 3 | Compare windows | p95 in last minute ≤ 1.5× p95 in first minute |

**Pass criteria**: 0 HTTP 5xx; p95 latency in last minute ≤ 1.5× p95 in first minute.
**Duration**: ~6 minutes.

---

### NFT-PERF-OUTBOX-DRAIN-01: FailsafeProducer drain rate

**Summary**: Under sustained writes, the outbox queue depth stays bounded.
**Traces to**: AC-N-03
**Metric**: `SELECT COUNT(*) FROM annotations_queue_records` sampled every 5s during the run.

**Preconditions**: NFT-PERF-THROUGHPUT-01 running; RabbitMQ broker reachable; no stream consumer back-pressure.

**Steps**:

| Step | Consumer Action | Measurement |
|------|----------------|-------------|
| 1 | While -THROUGHPUT-01 is running, sample queue depth every 5s for the full duration | record samples |
| 2 | Compute max queue depth + average drain interval | summary stats |

**Pass criteria**: max queue depth ≤ 100 rows; depth at end-of-run ≤ depth at start-of-run + 10.
**Duration**: 5 minutes (overlaid on -THROUGHPUT-01).

---

### NFT-PERF-SSE-FANOUT-01: SSE delivery latency under modest fan-out

**Summary**: 10 simultaneous SSE subscribers receive every event for their mission within the latency budget.
**Traces to**: AC-F-10
**Metric**: per-subscriber event-arrival latency (consumer wall-clock from `POST /annotations` returning to SSE event arrival).

**Preconditions**: SUT warm; clean state.

**Steps**:

| Step | Consumer Action | Measurement |
|------|----------------|-------------|
| 1 | Open 10 SSE connections to `/annotations/events?missionId=<m>` | all 10 alive |
| 2 | `POST /annotations` once for mission `<m>` | record post-return timestamp |
| 3 | Each subscriber records its event-arrival timestamp | per-subscriber latency |
| 4 | Compute max latency across the 10 subscribers | summary |

**Pass criteria**: every subscriber receives the event; max latency ≤ 1000ms.
**Duration**: 30s.

---

### NFT-PERF-LIST-01: Annotation listing on populated DB

**Summary**: `GET /annotations?limit=100` against a DB with 10,000 rows responds within budget.
**Metric**: end-to-end response latency.

**Preconditions**: DB pre-seeded with 10,000 annotations + 50,000 detections (use `dataseed` to insert via direct SQL, bypassing the public API for population speed — the test still queries via the public API).

**Steps**:

| Step | Consumer Action | Measurement |
|------|----------------|-------------|
| 1 | Warmup: 5× `GET /annotations?limit=100&offset=0` | discarded |
| 2 | Measure: 20× `GET /annotations?limit=100&offset=<random 0..9000>` | record per-call latency |
| 3 | p95 | summary |

**Pass criteria**: p95 ≤ 1000ms (read-only path; index `ix_annotations_created_date` should keep it fast).
**Duration**: ~1 minute.

---

### NFT-PERF-DATASET-01: Dataset class distribution at scale

**Summary**: `GET /dataset/class-distribution` against the populated DB.
**Metric**: end-to-end latency.

**Preconditions**: same populated DB as NFT-PERF-LIST-01.

**Steps**:

| Step | Consumer Action | Measurement |
|------|----------------|-------------|
| 1 | Warmup: 3 calls | discarded |
| 2 | Measure: 10 calls | record latency |

**Pass criteria**: p95 ≤ 2000ms.
**Duration**: ~30s.