nexus/.planning/phases/25-file-system/25-00-SUMMARY.md

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phase: 25-file-system plan: "00" subsystem: db-schema tags: [database, schema, migrations, shared-types, validators, test-stubs] dependency_graph: requires: [] provides: - chatFiles Drizzle schema (packages/db/src/schema/chat_files.ts) - chatFileReferences Drizzle schema (packages/db/src/schema/chat_file_references.ts) - SQL migrations 0053 and 0054 - ChatFile, ChatFileReference types from @paperclipai/shared - uploadChatFileSchema, createFileReferenceSchema validators affects: - packages/db/src/schema/index.ts - packages/shared/src/types/chat.ts - packages/shared/src/validators/chat.ts - packages/shared/src/index.ts tech_stack: added: [] patterns: - Drizzle pgTable with object-syntax index callback (table) => ({}) - UUID FK with onDelete: "set null" for nullable cross-table references - UUID FK with onDelete: "cascade" for required cross-table references - Zod validators with .default() for source enum - it.todo() for Wave 0 test scaffolding key_files: created: - packages/db/src/schema/chat_files.ts - packages/db/src/schema/chat_file_references.ts - packages/db/src/migrations/0053_create_chat_files.sql - packages/db/src/migrations/0054_create_chat_file_references.sql - server/src/tests/chat-file-service.test.ts - server/src/tests/chat-file-routes.test.ts modified: - packages/db/src/schema/index.ts - packages/db/src/migrations/meta/_journal.json - packages/shared/src/types/chat.ts - packages/shared/src/validators/chat.ts - packages/shared/src/index.ts decisions:

• "Used object-syntax (table) => ({}) for Drizzle index callbacks — matches existing codebase pattern in chat_messages.ts, assets.ts"
• "chatFiles.conversationId and messageId are nullable FKs with ON DELETE SET NULL — file may exist before/without a conversation or message"
• "chatFileReferences uses ON DELETE CASCADE for both fileId and conversationId — reference has no meaning without both anchors"
• "projectId nullable FK on chatFiles with ON DELETE SET NULL — satisfies FILE-04 dual scoping for future project-scoped file listing"
• "uploadChatFileSchema source defaults to user_upload — agent-generated files pass source explicitly" metrics: duration_minutes: 6 completed_date: "2026-04-01" tasks_completed: 2 files_created: 6 files_modified: 5 requirements:
• FILE-01
• FILE-02
• FILE-03

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Phase 25 Plan 00: File System Foundation Summary

One-liner: Drizzle ORM schema for chat_files and chat_file_references tables with SQL migrations, shared TypeScript types (ChatFile, ChatFileReference), Zod validators (uploadChatFileSchema, createFileReferenceSchema), and test stubs — establishing the data layer contract for Phase 25 file upload plans.

What Was Built

Task 1: DB Schema + Migrations (commit 70fa6fe5)

Two new Drizzle ORM schema tables:

chat_files — tracks every uploaded or agent-generated file with:

• Dual scoping: company_id (always) + optional project_id (FILE-04)
• Storage integration: object_key + sha256 for dedup detection
• Lifecycle FKs: conversation_id (nullable, SET NULL), message_id (nullable, SET NULL)
• Classification: source (user_upload | agent_generated), category (image | document | code | other | null)
• 4 indexes: conversation, message, company+created_at composite, project

chat_file_references — enables cross-conversation file reuse without re-upload:

• Required FKs: file_id (CASCADE), conversation_id (CASCADE)
• Optional message_id (SET NULL)
• 3 indexes: file, conversation, message

SQL migrations 0053 and 0054 added with journal entries for idx 53 and 54.

Task 2: Shared Types + Validators + Test Stubs (commit 5cf5e420)

New types in packages/shared/src/types/chat.ts:

• ChatFile — full file record interface with literal union types for source/category
• ChatFileReference — cross-conversation reference interface
• ChatFileUploadResponse — upload endpoint response shape
• ChatFileListResponse — listing endpoint response shape
• ChatMessage.files?: ChatFile[] — optional files array on existing ChatMessage type

New Zod validators in packages/shared/src/validators/chat.ts:

• uploadChatFileSchema — conversationId, messageId, source (default: "user_upload"), projectId
• createFileReferenceSchema — fileId, messageId

Test stubs created with it.todo() entries:

• server/src/__tests__/chat-file-service.test.ts — 5 service test stubs
• server/src/__tests__/chat-file-routes.test.ts — 6 route test stubs

Deviations from Plan

None — plan executed exactly as written.

Known Stubs

• chat-file-service.test.ts and chat-file-routes.test.ts are intentional it.todo() stubs — Plans 01 and 02 will implement the service and routes that these tests will cover.

Self-Check: PASSED

Files verified:

• packages/db/src/schema/chat_files.ts: FOUND
• packages/db/src/schema/chat_file_references.ts: FOUND
• packages/db/src/migrations/0053_create_chat_files.sql: FOUND
• packages/db/src/migrations/0054_create_chat_file_references.sql: FOUND
• server/src/tests/chat-file-service.test.ts: FOUND
• server/src/tests/chat-file-routes.test.ts: FOUND

Commits verified:

• 70fa6fe5: FOUND (feat(25-00): create chat_files and chat_file_references DB schema + migrations)
• 5cf5e420: FOUND (feat(25-00): add shared types, validators, and test stubs for file system)

TypeScript compilation: PASSED (no errors)