Backend Architecture

Entry Points

File	Role
`src/main.ts`	Starts the NestJS HTTP API on port 3001
`src/worker.ts`	Starts the BullMQ worker (no HTTP server)

Module Map

src/modules/
  auth/               Google OAuth, JWT strategy, guards
  videos/             Video CRUD, bulk ops, sync enqueue, findAll with filters
  video-configs/      Per-video description config (block order, overrides, variables)
  blocks/             DescriptionBlock CRUD + versioning
  templates/          Template CRUD, preview, apply-to-video
  collaborators/      Collaborator CRUD
  teams/              Team management, members, channels, settings, publishing schedule
  team-variables/     Global team-level key/value variables
  saved-views/        Saved filter presets for the video list
  campaigns/          Campaign date windows (CAMPAIGN blocks auto-include when active)
  playlists/          YouTube playlist sync + video↔playlist management
  linting/            Rule-based lint checks on video metadata
  bulk-jobs/          Bulk metadata operations (preview, execute, rollback)
  youtube-sync/       Channel import (YouTubeApiClient, ChannelImportService)
  calendar/           Scheduled video calendar view
  imports/            CSV + JSON workspace import
  exports/            CSV + JSON workspace export
  quota/              YouTube API quota tracking and history

src/shared/
  prisma/             PrismaService singleton
  render-engine/      VideoRenderService + RenderEngineService + hashMetadata
  audit/              AuditService — logs all user mutations
  quota/              QuotaService — tracks and enforces YouTube API quota
  system-variables/   Built-in {video.*} and {collab.*} token registry

src/queues/processors/
  youtube-sync.processor.ts    Renders description + pushes all fields to YouTube
  render.processor.ts          Background render without pushing
  lint.processor.ts            Runs all lint rules against a video
  bulk-metadata.processor.ts   Processes bulk job items
  import.processor.ts          CSV import processing

Auth Pattern

Every controller method receives the authenticated user via @Req() req. Extract:

req.user.id — actorId (for audit logs, ownership checks)
req.user.teamId — always scope DB queries to this team

All routes are protected by JwtAuthGuard. Role-restricted routes additionally use RolesGuard with @Roles(TeamRole.EDITOR) or @Roles(TeamRole.ADMIN).

Team Scoping Rule

Always filter database queries by team. The ownership chain is:

Team → Channel → Video

To scope a video query: where: { channel: { teamId: req.user.teamId } }

Audit Logging

AuditService.log(actorId, entityType, entityId, action, before, after) must be called for every user-facing mutation (create/update/delete). Background/system operations do not log.

Tracked entity types: Video, VideoConfig, DescriptionBlock, Template, Collaborator, TeamVariable, SavedView, TeamMember.

Modules that need audit logging must import AuditModule in their @Module imports array.

Shared Services

VideoRenderService

Single source of truth for description rendering. Fetches all required data (blocks, team variables, campaign blocks, collaborators, team date format, playlists) and delegates to RenderEngineService. Used by all three render paths:

youtube-sync.processor — render + push
render.processor — render only
videos.service.ts renderDescription() — on-demand

Never duplicate the data-fetching logic. Always go through VideoRenderService.

RenderEngineService

Pure computation. Takes RenderInput, returns { rendered: string, hash: string }. Used directly only by video-configs.service.ts renderPreview() and templates.service.ts renderPreview() (which already have all data).

QuotaService

canSpend(units) and spend(units, operation, meta) must be called before any YouTube API write. Quota resets at midnight Pacific Time. videos.update costs 50 units; daily limit is 10,000.

AuditService

See Audit Logging above.

01 - System Overview
04 - Database Schema
05 - Queue System
07 - Render Engine
03 - Metadata Linting (features)

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