# Phase 2 — Backfill Canonical Layer Implementation Plan

> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.

**Goal:** Populate canonical tables (`tournaments`, `participants`, `tournament_results`, `participant_surface_elos`) from existing per-window rows, and set the FK columns (`scoring_events.tournament_id`, `season_participants.participant_id`). No runtime behavior changes; canonical tables become populated but are not yet read by any code path.

**Architecture:** One-off script with `--dry-run` and `--sport` flags. For each `sports_seasons` row with `scoring_pattern='qualifying_points'`, upsert canonical rows by `(sport_id, name, year)` for tournaments and `(sport_id, name)` for participants; copy completed `event_results` up to `tournament_results`; merge existing `season_participant_surface_elos` rows into canonical `participant_surface_elos`. Real run is preceded by an exact-match dry-run review.

**Tech Stack:** TypeScript, Drizzle ORM, PostgreSQL, Vitest + test DB.

**Prerequisite:** Phase 1b complete. Tag `phase-1b-complete` exists. Baseline fixtures in `test-fixtures/baselines/` captured in Phase 1a.

**Reference:** `docs/superpowers/specs/2026-05-01-canonical-tournament-layer-design.md` — Phase 2 section.

**Important constraints:**
- Do not copy `qualifying_points_awarded` from `event_results` to `tournament_results`. QP stays per-window.
- Do not write `participant_qualifying_totals`-equivalent data to canonical. QP totals stay per-window.
- Abort if two windows disagree on a canonical participant's surface Elo values (not expected today; fail loud).

---

### Task 1: Write the scoring-event → tournament matcher (pure function, TDD)

**Why:** The matcher has zero DB dependency; extract and test it in isolation first.

**Files:**
- Create: `scripts/backfill/match-tournament.ts`
- Create: `scripts/backfill/__tests__/match-tournament.test.ts`

- [ ] **Step 1: Write failing tests**

```typescript
// scripts/backfill/__tests__/match-tournament.test.ts
import { describe, it, expect } from "vitest";
import { extractTournamentIdentity } from "../match-tournament";

describe("extractTournamentIdentity", () => {
  it("extracts (name, year) from a scoring event for golf", () => {
    const got = extractTournamentIdentity({
      name: "Masters Tournament",
      eventDate: "2026-04-09",
      eventType: "major_tournament",
    });
    expect(got).toEqual({ name: "Masters Tournament", year: 2026 });
  });

  it("uses eventDate year when event name doesn't embed year", () => {
    const got = extractTournamentIdentity({
      name: "Wimbledon",
      eventDate: "2026-07-01",
      eventType: "major_tournament",
    });
    expect(got).toEqual({ name: "Wimbledon", year: 2026 });
  });

  it("strips embedded year from name if present", () => {
    const got = extractTournamentIdentity({
      name: "Wimbledon 2026",
      eventDate: "2026-07-01",
      eventType: "major_tournament",
    });
    expect(got).toEqual({ name: "Wimbledon", year: 2026 });
  });

  it("throws if eventDate is null and name has no year", () => {
    expect(() =>
      extractTournamentIdentity({
        name: "Wimbledon",
        eventDate: null,
        eventType: "major_tournament",
      }),
    ).toThrow(/cannot determine year/i);
  });
});
```

- [ ] **Step 2: Run failing test**

Run: `npm run test:run -- scripts/backfill/__tests__/match-tournament.test.ts`
Expected: FAIL — module missing.

- [ ] **Step 3: Implement the pure function**

```typescript
// scripts/backfill/match-tournament.ts
interface ScoringEventInput {
  name: string;
  eventDate: string | null;
  eventType: string;
}

export interface TournamentIdentity {
  name: string;
  year: number;
}

const YEAR_SUFFIX = /\s+(\d{4})\s*$/;

export function extractTournamentIdentity(ev: ScoringEventInput): TournamentIdentity {
  const trimmed = ev.name.trim();
  const yearMatch = trimmed.match(YEAR_SUFFIX);
  let cleanName = trimmed;
  let year: number | null = null;

  if (yearMatch) {
    year = parseInt(yearMatch[1], 10);
    cleanName = trimmed.replace(YEAR_SUFFIX, "").trim();
  }

  if (year === null && ev.eventDate) {
    year = parseInt(ev.eventDate.slice(0, 4), 10);
  }

  if (year === null) {
    throw new Error(
      `cannot determine year for event "${ev.name}" — no year in name and eventDate is null`,
    );
  }

  return { name: cleanName, year };
}
```

- [ ] **Step 4: Verify tests pass**

Run: `npm run test:run -- scripts/backfill/__tests__/match-tournament.test.ts`
Expected: PASS.

- [ ] **Step 5: Commit**

```bash
git add scripts/backfill/
git commit -m "feat(backfill): tournament identity extraction from scoring events"
```

---

### Task 2: Write the backfill orchestrator with dry-run (TDD against test DB)

**Files:**
- Create: `scripts/backfill-canonical-layer.ts`
- Create: `scripts/__tests__/backfill-canonical-layer.test.ts`

- [ ] **Step 1: Write the test — empty DB no-op**

```typescript
// scripts/__tests__/backfill-canonical-layer.test.ts
import { describe, it, expect, beforeEach } from "vitest";
import { db } from "~/db/context";
import {
  tournaments,
  participants,
  tournamentResults,
  participantSurfaceElos,
  scoringEvents,
  seasonParticipants,
  sportsSeasons,
  sports,
  eventResults,
  seasonParticipantSurfaceElos,
} from "database/schema";
import { runBackfill } from "../backfill-canonical-layer";

async function truncateAll() {
  await db.delete(tournamentResults);
  await db.delete(participantSurfaceElos);
  await db.delete(participants);
  await db.delete(tournaments);
  await db.delete(eventResults);
  await db.delete(seasonParticipantSurfaceElos);
  await db.delete(seasonParticipants);
  await db.delete(scoringEvents);
  await db.delete(sportsSeasons);
  await db.delete(sports);
}

describe("backfill-canonical-layer", () => {
  beforeEach(async () => {
    await truncateAll();
  });

  it("no-ops on empty DB", async () => {
    const result = await runBackfill({ dryRun: false });
    expect(result.tournamentsCreated).toBe(0);
    expect(result.participantsCreated).toBe(0);
    expect(result.tournamentResultsCreated).toBe(0);
    expect(result.surfaceElosCreated).toBe(0);
  });
});
```

- [ ] **Step 2: Run failing test**

Expected: FAIL (module missing).

- [ ] **Step 3: Implement skeleton**

```typescript
// scripts/backfill-canonical-layer.ts
import { db } from "~/db/context";
import {
  tournaments,
  participants,
  tournamentResults,
  participantSurfaceElos,
  scoringEvents,
  seasonParticipants,
  sportsSeasons,
  eventResults,
  seasonParticipantSurfaceElos,
} from "database/schema";
import { eq, and, isNull } from "drizzle-orm";
import { extractTournamentIdentity } from "./backfill/match-tournament";

export interface BackfillOptions {
  dryRun: boolean;
  sportId?: string;
}

export interface BackfillReport {
  tournamentsCreated: number;
  tournamentsLinked: number; // scoringEvents with tournament_id now set
  participantsCreated: number;
  participantsLinked: number; // seasonParticipants with participant_id now set
  tournamentResultsCreated: number;
  surfaceElosCreated: number;
  warnings: string[];
  errors: string[];
}

export async function runBackfill(opts: BackfillOptions): Promise<BackfillReport> {
  const report: BackfillReport = {
    tournamentsCreated: 0,
    tournamentsLinked: 0,
    participantsCreated: 0,
    participantsLinked: 0,
    tournamentResultsCreated: 0,
    surfaceElosCreated: 0,
    warnings: [],
    errors: [],
  };

  // Eligible sports seasons
  const seasons = await db
    .select()
    .from(sportsSeasons)
    .where(eq(sportsSeasons.scoringPattern, "qualifying_points"));

  for (const season of seasons) {
    if (opts.sportId && season.sportId !== opts.sportId) continue;
    await backfillSeason(season, opts, report);
  }

  return report;
}

async function backfillSeason(
  season: typeof sportsSeasons.$inferSelect,
  opts: BackfillOptions,
  report: BackfillReport,
): Promise<void> {
  // Implemented in later tasks.
}
```

- [ ] **Step 4: Verify empty-DB test passes**

Run: `npm run test:run -- scripts/__tests__/backfill-canonical-layer.test.ts`
Expected: PASS (empty DB no-op).

- [ ] **Step 5: Commit**

```bash
git add scripts/backfill-canonical-layer.ts scripts/__tests__/backfill-canonical-layer.test.ts
git commit -m "feat(backfill): orchestrator skeleton with empty-DB test"
```

---

### Task 3: Tournament + scoring-event linking

**Files:**
- Modify: `scripts/backfill-canonical-layer.ts`
- Modify: `scripts/__tests__/backfill-canonical-layer.test.ts`

- [ ] **Step 1: Add failing test — golf window with 4 events**

Append to the test file:

```typescript
async function seedGolfWindowWith4Events() {
  const [sport] = await db
    .insert(sports)
    .values({ name: "Golf", type: "individual", simulatorType: "golf_qualifying_points" })
    .returning();

  const [ss] = await db
    .insert(sportsSeasons)
    .values({
      sportId: sport.id,
      year: 2026,
      scoringPattern: "qualifying_points",
      totalMajors: 4,
      majorsCompleted: 1,
    })
    .returning();

  const events = await db
    .insert(scoringEvents)
    .values([
      { sportsSeasonId: ss.id, name: "Masters Tournament", eventDate: "2026-04-09", eventType: "major_tournament", isQualifyingEvent: true },
      { sportsSeasonId: ss.id, name: "PGA Championship", eventDate: "2026-05-14", eventType: "major_tournament", isQualifyingEvent: true },
      { sportsSeasonId: ss.id, name: "US Open", eventDate: "2026-06-18", eventType: "major_tournament", isQualifyingEvent: true },
      { sportsSeasonId: ss.id, name: "The Open Championship", eventDate: "2026-07-16", eventType: "major_tournament", isQualifyingEvent: true },
    ])
    .returning();

  return { sport, ss, events };
}

it("creates tournaments and links scoringEvents for a golf window", async () => {
  const { sport, events } = await seedGolfWindowWith4Events();
  const report = await runBackfill({ dryRun: false });

  expect(report.tournamentsCreated).toBe(4);
  expect(report.tournamentsLinked).toBe(4);

  const ts = await db.select().from(tournaments).where(eq(tournaments.sportId, sport.id));
  expect(ts.map((t) => t.name).sort()).toEqual(
    ["Masters Tournament", "PGA Championship", "The Open Championship", "US Open"],
  );
  expect(ts.every((t) => t.year === 2026)).toBe(true);

  const linkedEvents = await db.select().from(scoringEvents).where(eq(scoringEvents.sportsSeasonId, events[0].sportsSeasonId));
  expect(linkedEvents.every((e) => e.tournamentId !== null)).toBe(true);
});
```

- [ ] **Step 2: Run failing test**

Expected: FAIL (nothing is created yet).

- [ ] **Step 3: Implement tournament backfill in `backfillSeason`**

```typescript
async function backfillSeason(season, opts, report) {
  const events = await db
    .select()
    .from(scoringEvents)
    .where(eq(scoringEvents.sportsSeasonId, season.id));

  for (const ev of events) {
    if (ev.tournamentId) continue; // already linked

    let identity;
    try {
      identity = extractTournamentIdentity({
        name: ev.name,
        eventDate: ev.eventDate,
        eventType: ev.eventType,
      });
    } catch (e: any) {
      report.errors.push(`event ${ev.id}: ${e.message}`);
      continue;
    }

    const existing = await db
      .select()
      .from(tournaments)
      .where(
        and(
          eq(tournaments.sportId, season.sportId),
          eq(tournaments.name, identity.name),
          eq(tournaments.year, identity.year),
        ),
      );

    let tournamentId: string;
    if (existing.length > 0) {
      tournamentId = existing[0].id;
    } else {
      if (!opts.dryRun) {
        const [row] = await db
          .insert(tournaments)
          .values({
            sportId: season.sportId,
            name: identity.name,
            year: identity.year,
            startsAt: ev.eventDate ? new Date(ev.eventDate) : null,
            status: ev.eventDate && new Date(ev.eventDate) < new Date() ? "completed" : "scheduled",
          })
          .returning();
        tournamentId = row.id;
      } else {
        tournamentId = "00000000-0000-0000-0000-000000000000"; // placeholder
      }
      report.tournamentsCreated += 1;
    }

    if (!opts.dryRun) {
      await db
        .update(scoringEvents)
        .set({ tournamentId })
        .where(eq(scoringEvents.id, ev.id));
    }
    report.tournamentsLinked += 1;
  }
}
```

- [ ] **Step 4: Run tests**

Run: `npm run test:run -- scripts/__tests__/backfill-canonical-layer.test.ts`
Expected: PASS.

- [ ] **Step 5: Commit**

```bash
git add scripts/
git commit -m "feat(backfill): link scoring events to canonical tournaments"
```

---

### Task 4: Participant backfill + linking

**Files:**
- Modify: `scripts/backfill-canonical-layer.ts`
- Modify: `scripts/__tests__/backfill-canonical-layer.test.ts`

- [ ] **Step 1: Add failing test**

```typescript
it("creates canonical participants and links season_participants", async () => {
  const { sport, ss } = await seedGolfWindowWith4Events();
  const [sp1] = await db
    .insert(seasonParticipants)
    .values({ sportsSeasonId: ss.id, name: "Rory McIlroy" })
    .returning();
  const [sp2] = await db
    .insert(seasonParticipants)
    .values({ sportsSeasonId: ss.id, name: "Scottie Scheffler" })
    .returning();

  const report = await runBackfill({ dryRun: false });
  expect(report.participantsCreated).toBe(2);
  expect(report.participantsLinked).toBe(2);

  const canonical = await db.select().from(participants).where(eq(participants.sportId, sport.id));
  expect(canonical.map((p) => p.name).sort()).toEqual(["Rory McIlroy", "Scottie Scheffler"]);

  const [relinkedSP] = await db.select().from(seasonParticipants).where(eq(seasonParticipants.id, sp1.id));
  expect(relinkedSP.participantId).toBe(canonical.find((p) => p.name === "Rory McIlroy")!.id);
});

it("re-running the backfill does not create duplicate canonical participants", async () => {
  const { ss } = await seedGolfWindowWith4Events();
  await db.insert(seasonParticipants).values({ sportsSeasonId: ss.id, name: "Jon Rahm" });

  await runBackfill({ dryRun: false });
  await runBackfill({ dryRun: false });

  const rows = await db.select().from(participants);
  expect(rows.filter((r) => r.name === "Jon Rahm")).toHaveLength(1);
});
```

- [ ] **Step 2: Run failing tests**

Expected: FAIL.

- [ ] **Step 3: Extend `backfillSeason` with participant logic**

Append inside `backfillSeason` (after the event loop):

```typescript
const seasonPs = await db
  .select()
  .from(seasonParticipants)
  .where(eq(seasonParticipants.sportsSeasonId, season.id));

for (const sp of seasonPs) {
  if (sp.participantId) continue;

  const existing = await db
    .select()
    .from(participants)
    .where(and(eq(participants.sportId, season.sportId), eq(participants.name, sp.name)));

  let canonicalId: string;
  if (existing.length > 0) {
    canonicalId = existing[0].id;
  } else {
    if (!opts.dryRun) {
      const [row] = await db
        .insert(participants)
        .values({ sportId: season.sportId, name: sp.name })
        .returning();
      canonicalId = row.id;
    } else {
      canonicalId = "00000000-0000-0000-0000-000000000000";
    }
    report.participantsCreated += 1;
  }

  if (!opts.dryRun) {
    await db
      .update(seasonParticipants)
      .set({ participantId: canonicalId })
      .where(eq(seasonParticipants.id, sp.id));
  }
  report.participantsLinked += 1;
}
```

- [ ] **Step 4: Run tests**

Expected: PASS.

- [ ] **Step 5: Commit**

```bash
git add scripts/
git commit -m "feat(backfill): canonical participants + season-participant linking"
```

---

### Task 5: Copy completed event results to tournament_results (Masters 2026 case)

**Files:**
- Modify: `scripts/backfill-canonical-layer.ts`
- Modify: `scripts/__tests__/backfill-canonical-layer.test.ts`

- [ ] **Step 1: Add failing test — Masters 2026 round-trip**

```typescript
it("copies completed event_results to tournament_results without touching QP", async () => {
  const { ss, events } = await seedGolfWindowWith4Events();
  const masters = events.find((e) => e.name === "Masters Tournament")!;
  const [sp] = await db
    .insert(seasonParticipants)
    .values({ sportsSeasonId: ss.id, name: "Scottie Scheffler" })
    .returning();

  await db.insert(eventResults).values({
    scoringEventId: masters.id,
    seasonParticipantId: sp.id,
    placement: 1,
    rawScore: "-10",
    qualifyingPointsAwarded: "100.00",
  });

  const report = await runBackfill({ dryRun: false });
  expect(report.tournamentResultsCreated).toBe(1);

  const trs = await db.select().from(tournamentResults);
  expect(trs).toHaveLength(1);
  expect(trs[0].placement).toBe(1);
  expect(trs[0].rawScore).toBe("-10");

  // QP on event_results must be untouched
  const [er] = await db.select().from(eventResults).where(eq(eventResults.scoringEventId, masters.id));
  expect(er.qualifyingPointsAwarded).toBe("100.00");
});
```

- [ ] **Step 2: Run failing test**

Expected: FAIL.

- [ ] **Step 3: Extend `backfillSeason`**

Append inside `backfillSeason` after participant linking:

```typescript
// Refresh events to get tournament_ids set earlier in this loop
const refreshedEvents = await db
  .select()
  .from(scoringEvents)
  .where(eq(scoringEvents.sportsSeasonId, season.id));

for (const ev of refreshedEvents) {
  if (!ev.tournamentId) continue;
  const ers = await db
    .select()
    .from(eventResults)
    .where(eq(eventResults.scoringEventId, ev.id));

  for (const er of ers) {
    // Find canonical participant via the season participant
    const [sp] = await db
      .select()
      .from(seasonParticipants)
      .where(eq(seasonParticipants.id, er.seasonParticipantId));
    if (!sp || !sp.participantId) continue;

    // Skip the zero-QP filler rows (they carry no new information)
    if (er.placement === null && er.rawScore === null) continue;

    const existing = await db
      .select()
      .from(tournamentResults)
      .where(
        and(
          eq(tournamentResults.tournamentId, ev.tournamentId),
          eq(tournamentResults.participantId, sp.participantId),
        ),
      );

    if (existing.length > 0) continue;

    if (!opts.dryRun) {
      await db.insert(tournamentResults).values({
        tournamentId: ev.tournamentId,
        participantId: sp.participantId,
        placement: er.placement,
        rawScore: er.rawScore,
      });
    }
    report.tournamentResultsCreated += 1;
  }
}
```

- [ ] **Step 4: Run tests**

Expected: PASS.

- [ ] **Step 5: Commit**

```bash
git add scripts/
git commit -m "feat(backfill): copy completed event_results into tournament_results"
```

---

### Task 6: Surface Elo backfill (with conflict detection)

**Files:**
- Modify: `scripts/backfill-canonical-layer.ts`
- Modify: `scripts/__tests__/backfill-canonical-layer.test.ts`

- [ ] **Step 1: Add failing tests**

```typescript
async function seedTennisWithSurfaceElo() {
  const [sport] = await db
    .insert(sports)
    .values({ name: "Tennis", type: "individual", simulatorType: "tennis_qualifying_points" })
    .returning();
  const [ss] = await db
    .insert(sportsSeasons)
    .values({ sportId: sport.id, year: 2026, scoringPattern: "qualifying_points", totalMajors: 4 })
    .returning();
  const [sp] = await db
    .insert(seasonParticipants)
    .values({ sportsSeasonId: ss.id, name: "Novak Djokovic" })
    .returning();
  await db
    .insert(seasonParticipantSurfaceElos)
    .values({
      participantId: sp.id,
      sportsSeasonId: ss.id,
      eloHard: 2100,
      eloClay: 2000,
      eloGrass: 2050,
      worldRanking: 3,
    });
  return { sport, ss, sp };
}

it("backfills canonical surface elo from the single per-window row", async () => {
  const { sport } = await seedTennisWithSurfaceElo();
  const report = await runBackfill({ dryRun: false });

  expect(report.surfaceElosCreated).toBe(1);
  const canonicalPs = await db.select().from(participants).where(eq(participants.sportId, sport.id));
  const [canonicalElo] = await db
    .select()
    .from(participantSurfaceElos)
    .where(eq(participantSurfaceElos.participantId, canonicalPs[0].id));
  expect(canonicalElo.eloHard).toBe(2100);
  expect(canonicalElo.eloClay).toBe(2000);
  expect(canonicalElo.eloGrass).toBe(2050);
  expect(canonicalElo.worldRanking).toBe(3);
});

it("aborts if two windows disagree on a canonical participant's surface elo", async () => {
  const { sport, ss, sp } = await seedTennisWithSurfaceElo();

  // Second window with same canonical participant name but different elo
  const [ss2] = await db
    .insert(sportsSeasons)
    .values({ sportId: sport.id, year: 2027, scoringPattern: "qualifying_points", totalMajors: 4 })
    .returning();
  const [sp2] = await db
    .insert(seasonParticipants)
    .values({ sportsSeasonId: ss2.id, name: "Novak Djokovic" })
    .returning();
  await db.insert(seasonParticipantSurfaceElos).values({
    participantId: sp2.id,
    sportsSeasonId: ss2.id,
    eloHard: 2099, // different
    eloClay: 2000,
    eloGrass: 2050,
  });

  const report = await runBackfill({ dryRun: false });
  expect(report.errors.some((e) => /conflict/i.test(e))).toBe(true);
});
```

- [ ] **Step 2: Run failing tests**

Expected: FAIL.

- [ ] **Step 3: Extend `backfillSeason`**

Append to `backfillSeason`:

```typescript
const elos = await db
  .select()
  .from(seasonParticipantSurfaceElos)
  .where(eq(seasonParticipantSurfaceElos.sportsSeasonId, season.id));

for (const row of elos) {
  const [sp] = await db
    .select()
    .from(seasonParticipants)
    .where(eq(seasonParticipants.id, row.participantId));
  if (!sp || !sp.participantId) continue;

  const [existing] = await db
    .select()
    .from(participantSurfaceElos)
    .where(eq(participantSurfaceElos.participantId, sp.participantId));

  if (existing) {
    const mismatched =
      existing.eloHard !== row.eloHard ||
      existing.eloClay !== row.eloClay ||
      existing.eloGrass !== row.eloGrass ||
      existing.worldRanking !== row.worldRanking;
    if (mismatched) {
      report.errors.push(
        `surface-elo conflict for canonical participant ${sp.participantId} (name=${sp.name})`,
      );
    }
    continue;
  }

  if (!opts.dryRun) {
    await db.insert(participantSurfaceElos).values({
      participantId: sp.participantId,
      eloHard: row.eloHard,
      eloClay: row.eloClay,
      eloGrass: row.eloGrass,
      worldRanking: row.worldRanking,
    });
  }
  report.surfaceElosCreated += 1;
}
```

- [ ] **Step 4: Run tests**

Expected: PASS.

- [ ] **Step 5: Commit**

```bash
git add scripts/
git commit -m "feat(backfill): canonical surface-elo with conflict detection"
```

---

### Task 7: CLI wrapper + dry-run output

**Files:**
- Create: `scripts/backfill-cli.ts` (CLI entry)
- Modify: `scripts/backfill-canonical-layer.ts` (optional — if the main file exported a report shape, we format it here)

- [ ] **Step 1: Write the CLI**

```typescript
// scripts/backfill-cli.ts
import { runBackfill, BackfillOptions } from "./backfill-canonical-layer";

function parseArgs(): BackfillOptions {
  const args = process.argv.slice(2);
  const opts: BackfillOptions = { dryRun: true };
  for (const a of args) {
    if (a === "--apply") opts.dryRun = false;
    else if (a === "--dry-run") opts.dryRun = true;
    else if (a.startsWith("--sport=")) opts.sportId = a.slice("--sport=".length);
    else if (a === "--help") {
      console.log("Usage: tsx scripts/backfill-cli.ts [--dry-run|--apply] [--sport=<uuid>]");
      process.exit(0);
    } else {
      console.error(`unknown arg: ${a}`);
      process.exit(1);
    }
  }
  return opts;
}

async function main() {
  const opts = parseArgs();
  console.log(`Running backfill (dryRun=${opts.dryRun}, sportId=${opts.sportId ?? "all"})`);
  const report = await runBackfill(opts);

  console.log("---");
  console.log(`tournamentsCreated:        ${report.tournamentsCreated}`);
  console.log(`tournamentsLinked:         ${report.tournamentsLinked}`);
  console.log(`participantsCreated:       ${report.participantsCreated}`);
  console.log(`participantsLinked:        ${report.participantsLinked}`);
  console.log(`tournamentResultsCreated:  ${report.tournamentResultsCreated}`);
  console.log(`surfaceElosCreated:        ${report.surfaceElosCreated}`);
  if (report.warnings.length) {
    console.log("\nWARNINGS:");
    for (const w of report.warnings) console.log(`  ${w}`);
  }
  if (report.errors.length) {
    console.log("\nERRORS:");
    for (const e of report.errors) console.log(`  ${e}`);
    process.exit(2);
  }
}

main().catch((e) => {
  console.error(e);
  process.exit(1);
});
```

- [ ] **Step 2: Add npm script**

In `package.json` scripts block, add:

```json
"backfill:canonical": "dotenv -- tsx scripts/backfill-cli.ts"
```

- [ ] **Step 3: Run dry-run locally**

Against the dev DB (loaded with `npm run db:sync-prod`):

Run: `npm run backfill:canonical -- --dry-run`
Expected: Non-zero `tournamentsCreated` etc., zero `errors`. Save stdout as `/tmp/backfill-dryrun.txt`.

- [ ] **Step 4: Inspect the dry-run output**

Review `/tmp/backfill-dryrun.txt`. For each category, sanity-check the count. For example, if we have 2 in-flight golf windows × 4 events each = 8 golf events, `tournamentsCreated` might be 4–8 depending on overlap.

- [ ] **Step 5: Commit**

```bash
git add scripts/backfill-cli.ts package.json
git commit -m "feat(backfill): CLI wrapper with dry-run default"
```

---

### Task 8: Go/no-go verification (real run on staging)

**Human in the loop** — this task is NOT automatable.

- [ ] **Step 1: Deploy all preceding commits to staging**

Via the project's normal deploy flow.

- [ ] **Step 2: Capture a pre-backfill snapshot of the in-flight windows**

On staging, run:

```bash
npx tsx scripts/capture-baseline.ts --out=/tmp/pre-backfill-staging
```

- [ ] **Step 3: Run dry-run on staging**

```bash
npm run backfill:canonical -- --dry-run
```

Expected: zero errors; counts match expectations.

- [ ] **Step 4: Human review of dry-run report**

Requires a human. Verify:
- Tournament names match real-world identity (no "Masters Tournament 2026" with year=null).
- Participant counts per sport are sensible.
- No conflict errors.

If anything looks wrong, fix in code (not in DB), redeploy, re-run dry-run.

- [ ] **Step 5: Run real backfill on staging**

```bash
npm run backfill:canonical -- --apply
```

Expected: Same counts as dry-run, zero errors.

- [ ] **Step 6: Verify no drift on QP totals**

```bash
npx tsx scripts/capture-baseline.ts --out=/tmp/post-backfill-staging
diff /tmp/pre-backfill-staging/ /tmp/post-backfill-staging/
```

Expected: **Zero differences in `qp-totals-*.json` and `event-results-*.json`**. Backfill must not touch these.

The `surface-elos-*.json` files may differ because this captures per-window Elo before Phase 2; after Phase 2 it still captures the same per-window table (`season_participant_surface_elos`), which is untouched by backfill. So diff should still be empty. If not, stop and investigate.

- [ ] **Step 7: Spot-check Masters 2026 round-trip on staging**

```bash
psql $STAGING_DB -c "
SELECT er.placement AS ev_placement, er.raw_score AS ev_score,
       tr.placement AS tr_placement, tr.raw_score AS tr_score,
       sp.name
FROM event_results er
JOIN scoring_events se ON se.id = er.scoring_event_id
JOIN tournaments t ON t.id = se.tournament_id
JOIN tournament_results tr ON tr.tournament_id = t.id
  AND tr.participant_id = (SELECT participant_id FROM season_participants WHERE id = er.season_participant_id)
JOIN season_participants sp ON sp.id = er.season_participant_id
WHERE t.name = 'Masters Tournament' AND t.year = 2026;
"
```

Expected: Every row has `ev_placement = tr_placement` and `ev_score = tr_score`.

- [ ] **Step 8: Proceed to production only if all checks pass**

Same flow on prod: capture baseline → dry-run → human review → apply → diff → Masters spot-check.

- [ ] **Step 9: Tag**

```bash
git tag phase-2-complete
```

---

## Self-Review Checklist

- [ ] `runBackfill` with `dryRun: true` writes nothing (verify via row-count diff).
- [ ] All tests in `scripts/__tests__/backfill-canonical-layer.test.ts` pass.
- [ ] After real run on prod: every `scoringEvents` row in a `qualifying_points` season has non-null `tournament_id`.
- [ ] Every `seasonParticipants` row in a `qualifying_points` season has non-null `participant_id`.
- [ ] Every completed `eventResults` row (non-null `placement` OR non-null `rawScore`) has a matching `tournamentResults` row.
- [ ] No drift in `participant_qualifying_totals` vs. baseline.
- [ ] Tag `phase-2-complete` on main.

## Rollback

Phase 2 is reversible because no production code reads canonical tables yet:

```sql
BEGIN;
UPDATE season_participants SET participant_id = NULL WHERE participant_id IS NOT NULL;
UPDATE scoring_events SET tournament_id = NULL WHERE tournament_id IS NOT NULL;
DELETE FROM tournament_results;
DELETE FROM participant_surface_elos;
DELETE FROM participants;
DELETE FROM tournaments;
COMMIT;
```

Then re-run backfill after fixing root cause.

Phase 3 begins only after `phase-2-complete` has been green in production for 24 hours.