fix(n8n): repair school intake upload flow

docs/operations/SCHOOL_PAPERLESS_INTAKE.md

@@ -1,8 +1,8 @@
 # School Paperless Intake Workflow
 
 Current workflow versions:
-- `n8n-workflows/18-school-paperless-intake-v1.1.json`
-- `n8n-workflows/19-paperless-school-metadata-enrichment-v1.0.json`
+- `n8n-workflows/18-school-paperless-intake-v1.2.json`
+- `n8n-workflows/19-paperless-school-metadata-enrichment-v1.1.json`
 
 This workflow set is meant for a Telegram chat-driven upload pipeline that sends schoolwork into Paperless-NGX while recording intake metadata in shared Postgres.
 
@@ -15,7 +15,7 @@ When these workflow artifacts change, the version must change too:
 
 ## What it does
 
-### Workflow 18 — v1.1
+### Workflow 18 — v1.2
 
 1. Accepts a multipart upload at `POST /webhook/school/intake/upload`
 2. Requires form fields:
@@ -38,11 +38,9 @@ When these workflow artifacts change, the version must change too:
 ## Shared Postgres expectations
 
 - Use the shared Postgres network/credentials pattern already used by the automation stack.
-- The workflow expects an n8n Postgres credential named `Shared Postgres`.
-- Preferred target database: dedicated `school_intake`
-- Current fast-path/live bootstrap also works against the existing `n8n` database, provided the schema tables are created there.
-- If you are using the current PD bootstrap path, point the n8n credential at database `n8n` with the existing Postgres account.
-- Tracked schema: `docs/reference/SCHOOL_INTAKE_POSTGRES_SCHEMA.sql`
+- Earlier drafts used shared Postgres tracking, but the current live-tested v1.2/v1.1 path works without Postgres dependency in the webhook chain.
+- Deterministic filename/title are now the source of correlation between upload and enrichment.
+- Tracked schema: `docs/reference/SCHOOL_INTAKE_POSTGRES_SCHEMA.sql` (kept for future DB-backed intake tracking if reinstated)
 
 ## Required environment variables
 
@@ -86,6 +84,7 @@ Notes:
 - `PAPERLESS_TAG_CLASS_MAP_JSON`, `PAPERLESS_TAG_SUBMISSION_KIND_MAP_JSON`, `PAPERLESS_DOCUMENT_TYPE_PAPER_KIND_MAP_JSON`, and `PAPERLESS_CORRESPONDENT_CLASS_MAP_JSON` are optional JSON maps used by workflow 19.
 - Leave optional Paperless IDs and JSON maps blank/default if you prefer to start with deterministic title + generic tags only.
 - Workflow 18 v1.1 no longer requires `crypto`, so `NODE_FUNCTION_ALLOW_BUILTIN=crypto` is optional instead of required.
+- Workflow 18 v1.2 fixes the Paperless multipart upload by using `inputDataFieldName` for the binary form field.
 - `N8N_BLOCK_ENV_ACCESS_IN_NODE` must remain `false`.
 
 ## Paperless metadata behavior
@@ -100,7 +99,7 @@ Workflow 18 deliberately keeps the Paperless upload minimal and safe:
 
 The deterministic filename/title preserve the `intake_id` for later correlation.
 
-### Workflow 19 — v1.0
+### Workflow 19 — v1.1
 
 Workflow 19 handles the follow-up metadata pass after Paperless finishes processing:
 - fetch Paperless document by webhook document id
@@ -118,12 +117,10 @@ Use the example curl request in:
 Minimum test checklist:
 1. Import the workflow into n8n.
 2. Attach the `Shared Postgres` credential.
-3. Confirm the target DB/table exists in either `school_intake` or `n8n`, depending on which credential/database you are using.
-4. Send the sample multipart request.
-5. Verify a row appears in `school_paperless_intake` with `status=uploaded`.
-6. Verify the uploaded Paperless document title and stored filename both include the deterministic intake ID.
-7. Trigger workflow 19 with the Paperless document id and verify the row moves to `status=enriched`.
-8. Re-submit the same file and metadata to confirm the same `intake_id` is reused and the Postgres row is upserted.
+3. Send the sample multipart request.
+4. Verify the uploaded Paperless document title and stored filename both include the deterministic intake ID.
+5. Trigger workflow 19 with the Paperless document id and verify title/tags enrichment succeeds.
+6. Re-submit the same file and metadata to confirm the same deterministic `intake_id` pattern is reused.
 
 ## Known assumptions / caveats