---
phase: 04-folders-sharing-quotas-document-ux
plan: 02
type: execute
wave: 1
depends_on: []
files_modified:
  - backend/migrations/versions/0004_phase4_pdf_open_mode_tsvector.py
  - backend/storage/minio_backend.py
autonomous: true
requirements:
  - FOLD-05
  - DOC-02
  - ADMIN-06

must_haves:
  truths:
    - "Alembic migration 0004 upgrades cleanly; downgrade reverses all DDL changes"
    - "users.pdf_open_mode column exists with server_default 'in_app'"
    - "GIN expression index ix_documents_fts on documents.extracted_text exists in PostgreSQL"
    - "MinIOBackend.put_object_raw() is callable for audit-logs bucket writes"
    - "audit-logs MinIO bucket is created when MINIO_ENDPOINT is set"
  artifacts:
    - path: "backend/migrations/versions/0004_phase4_pdf_open_mode_tsvector.py"
      provides: "Alembic migration: pdf_open_mode column, GIN FTS index, audit-logs bucket creation"
    - path: "backend/storage/minio_backend.py"
      provides: "put_object_raw(bucket, key, data, length, content_type) method added"
  key_links:
    - from: "backend/migrations/versions/0004_phase4_pdf_open_mode_tsvector.py"
      to: "backend/db/models.py"
      via: "Alembic op.execute GIN index must not collide with ORM model table_args"
      pattern: "ix_documents_fts"
    - from: "backend/tasks/audit_tasks.py"
      to: "backend/storage/minio_backend.py"
      via: "put_object_raw called by daily export task"
      pattern: "put_object_raw"
---

<objective>
Create Alembic migration 0004 and add MinIOBackend.put_object_raw(). This plan has no
dependency on the test scaffolds plan (04-01) and can run in parallel.

Purpose: Establish the database schema additions (pdf_open_mode, FTS index) and storage
method (put_object_raw for audit CSV upload) that later plans depend on.
Output: Migration file 0004 + extended MinIOBackend.
</objective>

<execution_context>
@$HOME/.claude/get-shit-done/workflows/execute-plan.md
@$HOME/.claude/get-shit-done/templates/summary.md
</execution_context>

<context>
@.planning/phases/04-folders-sharing-quotas-document-ux/04-CONTEXT.md
@.planning/phases/04-folders-sharing-quotas-document-ux/04-PATTERNS.md
@backend/migrations/versions/0003_multi_user_isolation.py
@backend/storage/minio_backend.py
@backend/db/models.py
</context>

<interfaces>
<!-- Key interfaces the executor needs. Extracted from codebase. -->
<!-- From backend/storage/minio_backend.py — existing put_object signature for reference: -->
<!--
async def put_object(
    self,
    file_bytes: bytes,
    content_type: str,
    user_id: str,
    document_id: str,
    ext: str,
) -> str:  # returns object_key
    ...
    await asyncio.to_thread(
        self._client.put_object,
        self._bucket,        # hardcoded documents bucket
        object_key,          # {user_id}/{document_id}/{uuid4()}{ext}
        io.BytesIO(file_bytes),
        length=len(file_bytes),
        content_type=content_type,
    )
    return object_key
-->
<!-- New put_object_raw signature (per D-17, PATTERNS.md):
async def put_object_raw(
    self,
    bucket: str,   # caller supplies bucket name (e.g., "audit-logs")
    key: str,      # caller supplies complete key (e.g., "audit-logs/2026-05-25.csv")
    data: io.BytesIO,
    length: int,
    content_type: str,
) -> None
-->
<!-- From backend/migrations/versions/0003_multi_user_isolation.py — batch_alter_table pattern:
with op.batch_alter_table("users") as batch_op:
    batch_op.add_column(sa.Column("col_name", sa.String(), nullable=False, server_default="value"))
-->
</interfaces>

<tasks>

<task type="auto">
  <name>Task 1: Alembic migration 0004 — pdf_open_mode column + GIN FTS index + audit-logs bucket</name>
  <files>backend/migrations/versions/0004_phase4_pdf_open_mode_tsvector.py</files>
  <read_first>
    backend/migrations/versions/0003_multi_user_isolation.py — read the entire file; extract the batch_alter_table pattern for adding columns, the MinIO bucket creation pattern gated on MINIO_ENDPOINT env var, the module docstring format, and the downgrade() function pattern
    backend/db/models.py — read lines 44-70 (User model) to confirm pdf_open_mode does NOT already exist before adding it
  </read_first>
  <action>
    Create backend/migrations/versions/0004_phase4_pdf_open_mode_tsvector.py.

    Module docstring (follow 0003 format): list three changes in order — (1) users.pdf_open_mode column, (2) GIN expression index on documents.extracted_text, (3) audit-logs MinIO bucket creation.

    Set: revision = "0004", down_revision = "0003", branch_labels = None, depends_on = None.

    upgrade() function — three steps in this exact order:

    Step 1: Add users.pdf_open_mode column using batch_alter_table (per D-10, for SQLite compat):
      `with op.batch_alter_table("users") as batch_op: batch_op.add_column(sa.Column("pdf_open_mode", sa.String(), nullable=False, server_default="in_app"))`

    Step 2: Create GIN expression index MANUALLY — do NOT use Column Computed() or Index() — use op.execute with raw SQL (per D-11, Pitfall 2, PATTERNS.md). The exact SQL is:
      `CREATE INDEX ix_documents_fts ON documents USING GIN (to_tsvector('english', coalesce(extracted_text, '')))`
    Add a comment above this line: `# managed manually — do not autogenerate (Alembic issue #1390)`.

    Step 3: Create the audit-logs MinIO bucket gated on MINIO_ENDPOINT env var (per Pitfall 8, PATTERNS.md). Follow the exact same guard pattern from migration 0003: `if os.environ.get("MINIO_ENDPOINT"):` then instantiate Minio client using env vars MINIO_ENDPOINT, MINIO_ACCESS_KEY, MINIO_SECRET_KEY with secure=False. Check `client.bucket_exists("audit-logs")` and call `client.make_bucket("audit-logs")` only if it does not exist.

    downgrade() function: (1) `op.execute("DROP INDEX IF EXISTS ix_documents_fts")`, (2) `with op.batch_alter_table("users") as batch_op: batch_op.drop_column("pdf_open_mode")`. Add a comment: `# MinIO bucket NOT reversed — bucket may contain audit data`.

    Imports needed at module top: `from __future__ import annotations`, `import os`, `import sqlalchemy as sa`, `from alembic import op`.
  </action>
  <verify>
    <automated>cd /Users/nik/Documents/Progamming/document_scanner/backend && python -c "from migrations.versions import 0004_phase4_pdf_open_mode_tsvector" 2>&1 || python -c "import importlib.util; spec = importlib.util.spec_from_file_location('m', 'migrations/versions/0004_phase4_pdf_open_mode_tsvector.py'); m = importlib.util.module_from_spec(spec); spec.loader.exec_module(m); print('OK')"</automated>
  </verify>
  <acceptance_criteria>
    - File exists at backend/migrations/versions/0004_phase4_pdf_open_mode_tsvector.py
    - `revision = "0004"` and `down_revision = "0003"` present in file
    - File contains `batch_alter_table("users")` with pdf_open_mode column, server_default="in_app"
    - File contains `CREATE INDEX ix_documents_fts ON documents USING GIN` (grep confirms)
    - File contains `# managed manually — do not autogenerate` comment
    - File contains `if os.environ.get("MINIO_ENDPOINT")` MinIO gate for audit-logs bucket
    - File contains `audit-logs` bucket name (grep confirms)
    - File contains `DROP INDEX IF EXISTS ix_documents_fts` in downgrade()
    - `python -c "import py_compile; py_compile.compile('migrations/versions/0004_phase4_pdf_open_mode_tsvector.py')"` exits 0 (no syntax errors)
  </acceptance_criteria>
  <done>Migration file is syntactically valid and contains all three upgrade steps + downgrade reversal.</done>
</task>

<task type="auto">
  <name>Task 2: Add put_object_raw() to MinIOBackend</name>
  <files>backend/storage/minio_backend.py</files>
  <read_first>
    backend/storage/minio_backend.py — read the entire file; identify the existing put_object() method signature and asyncio.to_thread() call pattern; identify the class definition and existing imports including io import
    backend/storage/base.py — read to see if StorageBackend ABC needs a corresponding abstract method added (it does NOT — put_object_raw is concrete only on MinIOBackend, not on the ABC, because only MinIOBackend has an audit-logs bucket)
  </read_first>
  <action>
    Add the put_object_raw() async method to the MinIOBackend class in backend/storage/minio_backend.py.

    Place it immediately after the existing put_object() method.

    Method signature: `async def put_object_raw(self, bucket: str, key: str, data: io.BytesIO, length: int, content_type: str) -> None:`

    Docstring: "Upload bytes to an arbitrary bucket+key (used for audit-logs CSV export). Unlike put_object(), does NOT apply the document key schema — the caller supplies the complete key. The main documents bucket is NOT used."

    Implementation: call `await asyncio.to_thread(self._client.put_object, bucket, key, data, length=length, content_type=content_type)`. This mirrors the exact pattern of the existing put_object() method (which uses self._client.put_object via asyncio.to_thread).

    Do NOT add io import if it already exists. Do NOT add this method to StorageBackend ABC (base.py) — this is MinIOBackend-only.
  </action>
  <verify>
    <automated>cd /Users/nik/Documents/Progamming/document_scanner/backend && python -c "from storage.minio_backend import MinIOBackend; import inspect; src = inspect.getsource(MinIOBackend.put_object_raw); print('OK')"</automated>
  </verify>
  <acceptance_criteria>
    - MinIOBackend.put_object_raw exists as an async method (grep: `async def put_object_raw`)
    - Method accepts: bucket: str, key: str, data: io.BytesIO, length: int, content_type: str
    - Method body calls `asyncio.to_thread(self._client.put_object, bucket, key, data, length=length, content_type=content_type)`
    - `python -c "from storage.minio_backend import MinIOBackend"` exits 0 (no import errors)
    - StorageBackend ABC (base.py) is NOT modified (grep: `put_object_raw` absent from base.py)
  </acceptance_criteria>
  <done>MinIOBackend.put_object_raw() is importable and callable; base.py unchanged.</done>
</task>

</tasks>

<threat_model>
## Trust Boundaries

| Boundary | Description |
|----------|-------------|
| Migration → MinIO | Bucket creation uses env var credentials; no credentials in code |
| put_object_raw → MinIO SDK | Caller supplies bucket name; method does not validate bucket against allowlist |

## STRIDE Threat Register

| Threat ID | Category | Component | Disposition | Mitigation Plan |
|-----------|----------|-----------|-------------|-----------------|
| T-04-02-01 | Tampering | migration 0004 GIN index | mitigate | Index created via raw SQL (not autogenerate) to prevent Alembic repeat-generation bug; comment documents the decision |
| T-04-02-02 | Information Disclosure | audit-logs MinIO bucket | mitigate | Bucket creation gated on MINIO_ENDPOINT env var (no hardcoded credentials); bucket policy is private-by-default (MinIO default) |
| T-04-02-03 | Tampering | put_object_raw caller-supplied key | accept | put_object_raw is called only from trusted application code (Celery task); key is constructed from application logic, not user input |
| T-04-SC | Tampering | npm/pip/cargo installs | accept | No new packages installed in this plan |
</threat_model>

<verification>
1. Verify migration syntax: `python -c "import py_compile; py_compile.compile('backend/migrations/versions/0004_phase4_pdf_open_mode_tsvector.py')"`
2. Verify MinIOBackend import: `cd backend && python -c "from storage.minio_backend import MinIOBackend; print(hasattr(MinIOBackend, 'put_object_raw'))"`
3. Grep checks: `grep -n "ix_documents_fts\|audit-logs\|pdf_open_mode\|put_object_raw" backend/migrations/versions/0004_phase4_pdf_open_mode_tsvector.py backend/storage/minio_backend.py`
</verification>

<success_criteria>
- Migration 0004 file is syntactically valid Python with revision="0004" and down_revision="0003"
- Migration contains all three upgrade steps: pdf_open_mode column, GIN FTS index, audit-logs bucket creation
- MinIOBackend.put_object_raw() is an async method that delegates to asyncio.to_thread
- No existing tests regress: `cd backend && pytest -v --no-header 2>&1 | grep -E "FAILED|ERROR"` returns nothing
</success_criteria>

<output>
Create `.planning/phases/04-folders-sharing-quotas-document-ux/04-02-SUMMARY.md` when done.
</output>
