# mail-body-ingest

Module 5, faza mailowa (`docs/kb/modules/05-faza-mailowa-plan.md`, §5, Krok 2). Second full
pass over the gmail `.eml` archive — `gmail-bulk-import` deliberately skipped inline
`text/plain`/`text/html` parts (`_parse_attachments` does `continue` on them); this job reads
exactly the content that gap left out, chunks it, embeds it, and inserts it into
`document_chunk` alongside the existing paperless chunks.

## Why a separate job, not an extension of documents-ingest's chunk_embed

`chunk_embed.py` is wired to `source='paperless'` + `entities[type=content]` (pre-extracted
text already in the DB). Mail content isn't in the DB yet — it has to be read from `.eml`
files, MIME-walked, quote-stripped, and classified, none of which paperless chunks need. The
only thing genuinely shared is the chunker itself, which is why it was extracted to
`kb_mail.chunking` first (Krok 0) instead of being copy-pasted here.

## Where it runs

**On SOLARIA** (needs Ollama on `localhost` for `/api/embed`), against `kb-postgres@PIHA` over
Tailscale. The `.eml` archive is rsync'd PIHA -> SOLARIA once (plan §7, Krok 4) rather than
read live over the network — 225k small files over Tailscale would be slow and fragile.

Install (from repo root, on SOLARIA):

```bash
pip install -e packages/kb-mail/
pip install -e packages/kb-retrieval/
pip install -e jobs/mail-body-ingest/
```

## Usage

```bash
# Dry run (default) — parse, quote-strip, classify, chunk, count. Zero Ollama calls, zero
# DB writes (including the threading UPDATE):
mail-body-ingest --dsn postgresql://kb:<pw>@piha:5433/kb --archive-root /home/oskar/kb/mail/archive

# Etap A pilot — last 12 months only (plan Decyzja 9):
mail-body-ingest --dsn ... --since 2025-07-01 --apply > mail-ingest-etapA.log 2>&1

# Smoke-test slice:
mail-body-ingest --dsn ... --apply --limit 10
```

DSN can also come from `KB_DSN`, Ollama URL from `OLLAMA_URL` (default
`http://localhost:11434` — this job is meant to run where Ollama lives).

## Pipeline (per envelope)

1. **Read** `archive_root / raw_ref` — `missing_file`/`read_error` counted like
   `gmail-header-backfill`.
2. **Parse**: typed (`policy.default`) with a `compat32` fallback (same ~9/225030 failure mode
   `gmail-header-backfill` documents).
3. **Body extraction**: inline `text/plain` preferred; HTML->text via a small stdlib
   `HTMLParser` when the mail is HTML-only (plan §1.3: 15% of the corpus) — zero new
   dependencies, skips `style`/`script`/`head` content.
4. **Quote-strip** (Decyzja 2): truncate at the earliest reply marker (`On ... wrote:`,
   `Dnia ... napisał(a):`, `W dniu ... pisze:`, `-----Original Message-----`, Outlook's
   underscore separator), then drop remaining `>`-quoted lines. In HTML, `blockquote` and
   `div.gmail_quote` subtrees are skipped before conversion to text. `quoted_chars_stripped`
   is tallied for calibration review (plan §7).
5. **Classification**: `newsletter` (`List-Unsubscribe`/`List-Id`/`Precedence: bulk|list`,
   read from the same parsed message); `body_empty` (after quote-strip — an empty mail is
   still counted, just produces zero chunks).
6. **Prefix** (Decyzya 3): `Temat: ... | Od: ... | Data: YYYY-MM-DD` built from the
   already-backfilled `entities[type=headers]` + `envelope.ts` — zero header re-parse.
7. **Chunk**: `kb_mail.chunking.chunk_text` (2400/600 chars, same as paperless).
8. **Embed + insert**: newsletter chunks are inserted immediately with
   `excluded_reason='newsletter'`, `embedding=NULL` (no Ollama call, reversible later);
   everything else is buffered up to `--batch-size` (default 64) and sent through
   `kb_retrieval.embed.embed_batch` (`/api/embed`) before inserting. `ON CONFLICT
   (envelope_id, chunk_index, model) DO NOTHING` is checked via the command tag, so a
   silent no-op counts as `chunks_conflict_skipped`, never `chunks_inserted`.
9. **Threading append** (Decyzja 10): `In-Reply-To`/`References` (angle brackets stripped,
   matching `envelope.id`'s bare-Message-ID convention) appended as
   `entities[type=threading]` via the same idempotent `WHERE NOT EXISTS` UPDATE pattern as
   `gmail-header-backfill` — done for every parsed envelope regardless of newsletter/
   body_empty status, since it's the same read either way.

## Stats must balance

```
mails_scanned = missing_file + read_errors + parse_errors + body_empty + mails_chunked
chunks_total  = chunks_inserted + chunks_newsletter_flagged + chunks_already_embedded
                + chunks_conflict_skipped + chunks_errors
```

Any non-zero `read_errors`/`parse_errors`/`missing_file`/`chunks_errors`/
`chunks_conflict_skipped`, or an unbalanced sum, makes the CLI exit 1 — same convention as
`gmail-header-backfill`/`documents-ingest`'s `chunk_embed`.

## Ollama-offline tolerance

A failed `embed_batch()` call is caught per-batch (`aiohttp.ClientError` -> the whole batch,
up to `--batch-size` chunks, counts as `chunks_errors`; the run logs a warning and continues).
Those chunks never enter the idempotency set, so a later re-run retries them automatically —
no separate checkpointing needed. Only a wrong embedding dimension
(`EmbeddingDimensionError`) aborts the entire run, since that would otherwise silently index
a vector that doesn't match `document_chunk.embedding VECTOR(1024)`.

## Idempotency

Pre-fetched `(envelope_id, chunk_index)` pairs, scoped server-side to `--model` (`WHERE model
= $1`), skip chunks already inserted — the pair doesn't need `model` redundantly since the
fetch is already scoped to it. Built this way from the start per the plan's note that
`chunk_embed.py`'s otherwise-equivalent pre-fetch is easy to mis-key across runs that mix
models (not an active bug there today, since one run always uses one model, but worth not
repeating the ambiguity here).

## Tests

```bash
pip install -e "jobs/mail-body-ingest[dev]"
cd jobs/mail-body-ingest && pytest
```

Pure unit tests (48), no DB/Ollama — `run()` is tested by monkeypatching `asyncpg.connect`
and `aiohttp.ClientSession` with in-memory fakes, `.eml` bytes written to `tmp_path`. Covers:
quote-strip (EN/PL/Outlook markers, bare `>` lines), HTML->text (style/script/blockquote/
gmail_quote skipping), newsletter classification, threading extraction, prefix building,
body extraction (plain-preferred, HTML fallback, attachment-only), the typed/compat32 parse
fallback, stats balance, idempotency (second run inserts nothing new), newsletter chunks
never reaching Ollama, Ollama-offline batch isolation, and dimension-mismatch abort.

## Definition of Done

Per `CLAUDE.md`: `pytest` passes (48/48) + a `--limit 5` dry-run smoke against live
`kb-postgres@PIHA` before committing (confirms DSN/query wiring; a missing local archive
mirror correctly reports `missing_file` rather than crashing). The Etap A pilot (`--since
2025-07-01 --apply`, plan §7) is a separate, explicitly-confirmed run — not part of this
job's DoD, since it's the first real write against production data.