Bulk perf-test data seeder (sm seed) for Products, Orders, AuditLogs

[antosubash]

Summary

Adds a sm seed CLI subcommand that populates the configured database with large volumes of realistic test data, so list endpoints, joins, and time-range queries can be benchmarked against populated tables instead of empty/near-empty ones.

Defaults: 1M Products, 100K Orders (~250K items), 500K AuditLogs — all overridable via --count. 1M is a reasonable target for the flat Products table on PostgreSQL or SQLite; keeping Orders at 100K avoids blowing up items to multi-millions (composite PK, items 1–5 per order).

What it does

• New sm seed command in the existing Spectre.Console CLI.
• Backed by a new console project tools/SimpleModule.PerfSeeder/ that references the three target modules directly. The CLI shells out to it so sm itself doesn't need module references.
• Uses EF Core batched inserts (AutoDetectChangesEnabled=false, ChangeTracker.Clear per batch, single transaction wrapping each module phase). Provider-agnostic — works with the default SQLite config, PostgreSQL, or SQL Server.
• SQLite fast path: sets PRAGMA journal_mode=WAL, synchronous=NORMAL, temp_store=MEMORY for the seeder's connection.
• Deterministic data via Bogus with --seed (default 42).
• Safety rails: --truncate preserves the 10 migration-seed Products (Id ≤ 10); Orders truncate deletes children first.

Usage

# All three modules with defaults
sm seed

# Just products, custom count, truncate first
sm seed --module products --count 2000000 --truncate

# Fresh dev DB (calls EnsureCreated when migrations aren't applied)
sm seed --create-schema

# Override connection (e.g. against a local Postgres)
sm seed --connection "Host=localhost;Database=perf;Username=postgres;Password=x"

Options: --module (products|orders|auditlogs|all), --count, --connection, --provider, --batch-size (default 5000), --seed (default 42), --truncate, --create-schema.

Test plan

• sm seed --help prints the full option set
• Smoke test: 500 Products + 500 Orders + 500 AuditLogs against fresh SQLite — all succeed, Orders wrote 1,473 items (1–5 per order as designed)
• Throughput check: 50K Products in Release against SQLite → ~12K rows/s (~85s projected for 1M)
• Full-scale run: sm seed --truncate against a developer machine — verify 1M Products, 100K Orders, 500K AuditLogs land cleanly
• End-to-end: start the host after a seed, hit GET /api/products and spot-check response times / EXPLAIN plans
• Postgres sanity: run sm seed --provider PostgreSql --connection ... against a local PG (blocked on the pre-existing migration drift for non-SQLite providers — orthogonal to this PR)

Notes / scope

• The CLI is the user-facing entry point; the underlying SimpleModule.PerfSeeder console app can also be invoked directly (dotnet run --project tools/SimpleModule.PerfSeeder -- ...).
• Did not add bulk seeders for Users / Permissions / OpenIddict — those need Identity / auth setup and are unsuited to hot-path bulk insertion.
• No changes to existing modules, migrations, runtime code, or CI. Added project is excluded from dotnet test by convention (no Tests suffix).

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