refactor: replace ConsoleLogger with nestjs-pino for ISO 8601 timestamps

[silent-cipher]

Summary

Backend JSON logs emitted a Unix millisecond integer for the timestamp field ("timestamp":1775081543138), making logs difficult to read in production tooling without post-processing. This PR replaces the default NestJS ConsoleLogger with nestjs-pino / pino-http to produce human-friendly ISO 8601 timestamps while preserving the existing ConsoleLogger-compatible JSON field layout.

Log format (before -> after)

Before:

{"level":"log","pid":12671,"timestamp":1776163682800,"message":{"event":"synapse_initialization","message":"Creating shared Synapse instance"},"context":"DealService"}
{"level":"log","pid":12671,"timestamp":1776163682802,"message":{"event":"pgboss_initialization","message":"Starting pg-boss initialization"},"context":"JobsService"}

After:

{"level":"log","timestamp":"2026-04-14T11:05:01.191Z","pid":13785,"context":"DealService","message":{"event":"synapse_initialization","message":"Creating shared Synapse instance"}}
{"level":"log","timestamp":"2026-04-14T11:05:01.193Z","pid":13785,"context":"JobsService","message":{"event":"pgboss_initialization","message":"Starting pg-boss initialization"}}

closes #432

[Copilot]

Pull request overview

This PR switches the backend’s logging implementation from Nest’s ConsoleLogger to nestjs-pino/pino-http to emit ISO 8601 timestamps (and keep a ConsoleLogger-like JSON shape) for improved readability in production logs.

Changes:

• Add nestjs-pino, pino, and pino-http dependencies and lockfile updates.
• Introduce shared pino configuration (buildLoggerModuleParams, createPinoExitLogger) and wire LoggerModule into AppModule and WorkerModule.
• Update bootstrap/startup logging paths (main.ts, database.module.ts) to use pino-based loggers and remove the old log-levels.ts helper.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
pnpm-lock.yaml	Adds lock entries for nestjs-pino, pino, and pino-http.
apps/backend/package.json	Adds runtime deps needed for the new logger stack.
apps/backend/src/common/pino.config.ts	New shared logger config + exit logger factory.
apps/backend/src/app.module.ts	Registers LoggerModule for API runtime logging.
apps/backend/src/worker.module.ts	Registers LoggerModule for worker/metrics runtime logging.
apps/backend/src/main.ts	Activates NativeLogger during bootstrap and replaces pre-bootstrap logger.
apps/backend/src/database/database.module.ts	Replaces startup diagnostics logger with pino-based logger.
apps/backend/src/common/log-levels.ts	Removes old ConsoleLogger log-level resolution helper.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

Comments suppressed due to low confidence (2)

apps/backend/src/app.module.ts:24

• LoggerModule.forRoot(buildLoggerModuleParams()) is evaluated before ConfigModule.forRoot(...), so any .env values loaded by Nest Config (including LOG_LEVEL) won’t be available when buildLoggerModuleParams() reads process.env. Reorder the imports array so ConfigModule.forRoot(...) is evaluated first, or switch to LoggerModule.forRootAsync and inject ConfigService to resolve the log level after config initialization.

  imports: [
    LoggerModule.forRoot(buildLoggerModuleParams()),
    ConfigModule.forRoot({
      load: [loadConfig],
      validationSchema: configValidationSchema,
      isGlobal: true,
    }),

apps/backend/src/worker.module.ts:17

• Same issue as AppModule: LoggerModule.forRoot(buildLoggerModuleParams()) runs before ConfigModule.forRoot(...), so .env-loaded values (e.g., LOG_LEVEL) won’t be present when logger params are built. Reorder these calls or use forRootAsync with ConfigService so logger configuration uses the validated/loaded config.

  imports: [
    LoggerModule.forRoot(buildLoggerModuleParams()),
    ConfigModule.forRoot({
      load: [loadConfig],
      validationSchema: configValidationSchema,
      isGlobal: true,
    }),

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[rjan90]

One small nit to reduce extra logging. Else it looks good to me