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+# Dragonstash Grouping System Audit & Enhancement Report
+
+## Appendix: Real-World Failure Cases (2026-03-29/30)
+
+These skipped packages reveal two concrete issues:
+
+### Issue A: `WORKER_MAX_ZIP_SIZE_MB` was 4 GB — blocking all large multipart archives
+
+| File | Parts | Total Size | Status |
+|------|-------|-----------|--------|
+| DM-Stash - Guide to Tharador - Complete STL | 19 | 70.5 GB | SIZE_LIMIT |
+| DM-Stash - 2023-05 - Greywinds All-in | 16 | 58.9 GB | SIZE_LIMIT |
+| Axolote Gaming - Castle of the Vampire Lord | 10 | 18 GB | SIZE_LIMIT |
+| Dungeon Blocks - THE ULTIMATE DUNGEON | 5 | 7.6 GB | SIZE_LIMIT |
+| Dungeon Blocks - The Toxic sewer | 4 | 6.2 GB | SIZE_LIMIT |
+| Soulmist | 4 | 6.3 GB | SIZE_LIMIT |
+| Medieval Town PT1 | 3 | 5.7 GB | SIZE_LIMIT |
+| Knight Models - Game Of Thrones | 3 | 5.5 GB | SIZE_LIMIT |
+| Dungeon Blocks - The Lost Cave | 3 | 4.9 GB | SIZE_LIMIT |
+| El Miniaturista 2025-05 Fulgrim Part II and III | 5 | 4.7 GB | SIZE_LIMIT |
+
+**Root cause:** Production env had `WORKER_MAX_ZIP_SIZE_MB=4096`. The default in code is 204800 (200 GB), but docker-compose.yml defaulted to 4096.
+
+**Fix applied:** Raised to 204800 in `/opt/stacks/DragonsStash/.env`. Worker restarted. These archives will be retried on the next ingestion cycle. The worker downloads parts individually (each under 2-4 GB), concatenates, re-splits at 1950 MiB for upload. Peak temp disk usage for the 70.5 GB archive: ~211 GB (353 GB available).
+
+**Code fix:** `MAX_PART_SIZE` is now configurable via `MAX_PART_SIZE_MB` env var (was hardcoded at 1950). Set to 3900 for Telegram Premium accounts to avoid unnecessary splitting.
+
+### Issue B: Download failure at 98% (DE1-Supported.7z)
+
+| File | Size | Error |
+|------|------|-------|
+| DE1-Supported.7z | 1.9 GB | Download stopped unexpectedly at 2043674624/2078338541 bytes (98%) |
+
+**Root cause:** Download stalled near completion with no retry mechanism.
+
+**Fix applied:** Earlier in this session, download retry logic was added (max 3 retries with `cancelDownloadFile` before each retry). This file will be retried automatically on next ingestion cycle.
+
+---
+
+## Deliverable 1: Audit Report — Current State
+
+### 1.1 Grouping Signal Stack (Current)
+
+The system currently uses exactly **one automatic grouping signal**:
+
+| Priority | Signal | Status | Location |
+|----------|--------|--------|----------|
+| 1 | `mediaAlbumId` | Implemented | `worker/src/grouping.ts:26-33` |
+| 2 | Manual override | Implemented | `src/lib/telegram/queries.ts:606-639` |
+
+**How it works:**
+- `processAlbumGroups()` in `worker/src/grouping.ts` groups indexed packages by `mediaAlbumId` (filtering out "0" and null)
+- For albums with 2+ members: creates `PackageGroup`, links packages, assigns name from album photo caption or first filename
+- Manual grouping via UI: select 2+ packages, enter name, creates group in `createManualGroup()`
+
+**What does NOT exist:**
+- No `message_thread_id` (forum topic) scoping
+- No project/month pattern extraction from filenames
+- No creator/sender grouping
+- No time-window + sender clustering
+- No reply chain analysis
+- No ZIP internal path prefix matching
+- No caption fuzzy matching
+- No staging queue for ungrouped files
+
+### 1.2 Multipart Archive Detection (`worker/src/archive/multipart.ts`)
+
+This is a **separate system** from display grouping. `groupArchiveSets()` groups Telegram messages into `ArchiveSet[]` based on filename patterns:
+
+- `.zip.001`, `.zip.002` → ZIP_NUMBERED
+- `.z01`, `.z02`, `.zip` → ZIP_LEGACY
+- `.part1.rar`, `.part2.rar` → RAR_PART
+- `.r00`, `.r01`, `.rar` → RAR_LEGACY
+
+These are grouped by `format:baseName.toLowerCase()` key. This is about **reassembling split archives**, not UI grouping. An `ArchiveSet` becomes a single `Package` in the database.
+
+### 1.3 TDLib Ingestion Handler
+
+**Pipeline in `worker/src/worker.ts:801-1197`:**
+```
+processOneArchiveSet():
+  1. Early skip check (source message ID)
+  2. Size guard (maxZipSizeMB)
+  3. Download all parts
+  4. Compute SHA-256 hash
+  5. Check hash dedup
+  6. Read archive metadata
+  7. Split/repack if needed
+  8. Upload to destination
+  9. Download preview
+ 10. Extract fallback preview
+ 11. Resolve creator
+ 12. Index in database
+ 13. Cleanup temp files
+```
+
+**Post-indexing:** `processAlbumGroups()` is called once per channel/topic scan to create album-based groups.
+
+**Gaps:**
+- Messages are never "dropped" silently — failures go to `SkippedPackage` table with reason
+- Watermark only advances past successfully processed sets (failed sets block advancement)
+- No messages are missed within a channel, but there's no audit to verify completeness after the fact
+
+### 1.4 Hash Verification
+
+**What IS verified:**
+| Check | Where | When |
+|-------|-------|------|
+| Download file size | `download.ts:verifyAndMove()` | After each file download |
+| SHA-256 content hash | `worker.ts:952` | After download, used for dedup |
+| Telegram upload confirmation | `channel.ts:updateMessageSendSucceeded` | Waits for server ACK |
+
+**What is NOT verified:**
+| Gap | Impact |
+|-----|--------|
+| No hash after upload | Can't detect Telegram-side corruption |
+| No hash after split | Split files could be silently corrupted |
+| CRC-32 extracted but never checked | ZIP/RAR per-file integrity not validated |
+| No end-to-end hash | Split files have different hash than original |
+| No periodic audit job | Stale/missing data never detected |
+
+### 1.5 File Size Limit
+
+| Setting | Value | Configurable? | Location |
+|---------|-------|---------------|----------|
+| `MAX_PART_SIZE` | 1950 MiB | **Hardcoded** | `worker/src/archive/split.ts:14` |
+| `MAX_UPLOAD_SIZE` | 1950 MiB | **Hardcoded** | `worker/src/worker.ts:1023` |
+| `maxZipSizeMB` | 200 GB | `WORKER_MAX_ZIP_SIZE_MB` env var | `worker/src/util/config.ts:6` |
+
+The 1950 MiB limit is deliberately below 2 GiB to avoid TDLib's `FILE_PARTS_INVALID` error. There is **no Premium awareness** — all accounts are treated as non-Premium.
+
+### 1.6 Search Implementation
+
+- **No fuzzy search** — uses Prisma's `contains` with `mode: "insensitive"` (translates to PostgreSQL `ILIKE`)
+- **No full-text search infrastructure** — no `tsvector`, no GiST/GIN indexes
+- **Indexes:** B-tree on `fileName`, `creator`, `archiveType`, `indexedAt`, plus `PackageFile.fileName` and `extension`
+- Search works for substring matching but won't match typos or similar names
+
+### 1.7 Notification Infrastructure
+
+- **pg_notify channels:** `bot_send`, `new_package` (bot), plus 7 worker channels
+- **Bot subscriptions:** pattern-match (case-insensitive substring) on `fileName` and `creator`
+- **UI notifications:** Sonner toast (ephemeral only)
+- **No persistent notification store** — no database model for notifications
+- **No notification UI panel** in the web app
+- **No alerts for:** grouping conflicts, hash mismatches, missing parts, upload failures (beyond SkippedPackage table)
+
+---
+
+## Deliverable 2: Revised Grouping Signal Stack
+
+### Recommended Implementation Plan
+
+I recommend an **incremental approach** — implement signals in phases, starting with highest-value/lowest-risk.
+
+### Phase 1: Foundation (Required Before Other Signals)
+
+#### Signal 9: Manual Override Persistence
+**Status:** Partially implemented. Manual groups exist but don't influence future auto-grouping.
+
+**Implementation:**
+- Add `groupingSource` field to `PackageGroup`: `"ALBUM" | "MANUAL" | "AUTO_PATTERN" | "AUTO_TIME" | "AUTO_REPLY" | "AUTO_ZIP" | "AUTO_CAPTION"`
+- Manual groups already persist. What's missing is the **training feedback** where a manual grouping teaches the system to auto-group similar future files.
+- This requires a `GroupingRule` model (see schema diff below) that stores learned patterns from manual overrides.
+
+#### Ungrouped Staging Queue
+**Implementation:**
+- After ingestion, packages without a `packageGroupId` are naturally "ungrouped"
+- Add a filter/tab to the STL page: "Ungrouped" showing packages where `packageGroupId IS NULL`
+- No schema change needed — just a query filter
+
+### Phase 2: High-Value Automatic Signals
+
+#### Signal 1: `mediaAlbumId` (Already Implemented)
+No changes needed. This is working correctly.
+
+#### Signal 2: `message_thread_id` Forum Topic Scoping
+**Status:** Already used for scan scoping (worker scans by topic), but not used as a grouping signal.
+
+**Implementation:**
+- `sourceTopicId` is already stored on `Package` (schema line 469)
+- Use it as a **scoping constraint** for all other signals: time-window, caption matching, etc. only apply within the same topic
+- No additional schema changes needed
+
+#### Signal 5: Time Window + Sender Grouping
+**Implementation:**
+- After album grouping, find ungrouped packages from the same source channel + topic
+- Within a configurable window (default 5 min), cluster by proximity
+- Since we don't have `sender_id` from the source channel (TDLib `searchChatMessages` doesn't return it for channels), this becomes **time-window within topic/channel**
+- New config: `AUTO_GROUP_TIME_WINDOW_MINUTES` (default: 5)
+
+#### Signal 3: Project/Month Pattern Extraction
+**Implementation:**
+- Extract date patterns from filenames/captions: `YYYY-MM`, `YYYY_MM`, `MonthName Year`
+- Extract project slugs: common prefix before separator (e.g., "ProjectName - File1.zip" and "ProjectName - File2.zip")
+- Group packages with matching patterns from the same channel
+- This should run as a **post-processing pass** after time-window grouping, merging small time-window groups that share a pattern
+
+#### Signal 4: Creator Grouping
+**Implementation:**
+- The `creator` field is already extracted from filenames and stored per-package
+- Within a channel, if multiple ungrouped packages have the same `creator` and were indexed within the same ingestion run, auto-group them
+- Lower priority than time-window (might create overly broad groups)
+
+### Phase 3: Advanced Signals
+
+#### Signal 6: Reply Chain
+**Implementation:**
+- TDLib messages have `reply_to_message_id` but this isn't currently captured during scanning
+- Would need to modify `getChannelMessages()` in `download.ts` to extract `reply_to_message_id`
+- Then: if message B replies to message A, and both are archives, group them
+- **Moderate complexity**, deferred to Phase 3
+
+#### Signal 7: ZIP Internal Path Prefix
+**Implementation:**
+- Already have `PackageFile.path` stored for each file inside an archive
+- After indexing, find the common root folder across all files
+- If two packages share the same root prefix and same channel, suggest grouping
+- This is a **post-hoc analysis** that could run as a background job
+
+#### Signal 8: Caption Fuzzy Match
+**Implementation:**
+- Currently captions from source messages are NOT stored (only photo captions for preview matching)
+- Would need to capture `msg.content?.caption?.text` during scanning and store on Package
+- Then: fuzzy-match captions from nearby messages in same channel
+- **Requires schema change + scan modification**, deferred to Phase 3
+
+---
+
+## Deliverable 3: Schema Diff
+
+All changes are **additive** — no columns dropped, no types changed.
+
+```prisma
+// ── PackageGroup additions ──
+model PackageGroup {
+  // ... existing fields ...
+  groupingSource  GroupingSource  @default(MANUAL)  // NEW: how this group was created
+}
+
+// NEW enum
+enum GroupingSource {
+  ALBUM           // From Telegram mediaAlbumId
+  MANUAL          // User-created via UI
+  AUTO_PATTERN    // Filename/date pattern matching
+  AUTO_TIME       // Time-window clustering
+  AUTO_REPLY      // Reply chain
+  AUTO_ZIP        // ZIP path prefix
+  AUTO_CAPTION    // Caption fuzzy match
+}
+
+// ── Package additions ──
+model Package {
+  // ... existing fields ...
+  sourceCaption   String?         // NEW: caption text from source Telegram message
+}
+
+// ── New model: GroupingRule (training from manual overrides) ──
+model GroupingRule {
+  id              String          @id @default(cuid())
+  sourceChannelId String
+  pattern         String          // Regex or glob pattern learned from manual grouping
+  signalType      GroupingSource  // Which signal this rule applies to
+  confidence      Float           @default(1.0)
+  createdAt       DateTime        @default(now())
+  createdByGroupId String?        // The manual group that spawned this rule
+
+  sourceChannel   TelegramChannel @relation(fields: [sourceChannelId], references: [id], onDelete: Cascade)
+
+  @@index([sourceChannelId])
+  @@map("grouping_rules")
+}
+
+// ── New model: SystemNotification ──
+model SystemNotification {
+  id              String              @id @default(cuid())
+  type            NotificationType
+  severity        NotificationSeverity @default(INFO)
+  title           String
+  message         String
+  context         Json?               // Structured data: packageId, groupId, sourceMessageId, etc.
+  isRead          Boolean             @default(false)
+  createdAt       DateTime            @default(now())
+
+  @@index([isRead, createdAt])
+  @@index([type])
+  @@map("system_notifications")
+}
+
+enum NotificationType {
+  HASH_MISMATCH
+  MISSING_PART
+  UPLOAD_FAILED
+  DOWNLOAD_FAILED
+  GROUPING_CONFLICT
+  INTEGRITY_AUDIT
+}
+
+enum NotificationSeverity {
+  INFO
+  WARNING
+  ERROR
+}
+
+// ── Config additions (worker/src/util/config.ts) ──
+// maxPartSizeMB: parseInt(process.env.MAX_PART_SIZE_MB ?? "1950", 10)
+// autoGroupTimeWindowMinutes: parseInt(process.env.AUTO_GROUP_TIME_WINDOW_MINUTES ?? "5", 10)
+// telegramPremium: process.env.TELEGRAM_PREMIUM === "true"
+```
+
+**Migration notes:**
+- All new fields are optional/have defaults — zero-risk to existing data
+- `GroupingSource` enum added with `@default(MANUAL)` — existing groups unaffected
+- `GroupingRule` and `SystemNotification` are new tables — no impact on existing
+- Backfill: set `groupingSource = ALBUM` for groups where `mediaAlbumId IS NOT NULL`
+
+---
+
+## Deliverable 4: Notification Contract
+
+### Event Shape
+
+```typescript
+interface SystemNotificationEvent {
+  type: NotificationType;
+  severity: "INFO" | "WARNING" | "ERROR";
+  title: string;
+  message: string;
+  context: {
+    packageId?: string;
+    groupId?: string;
+    sourceChannelId?: string;
+    sourceMessageId?: bigint;
+    fileName?: string;
+    partNumber?: number;
+    totalParts?: number;
+    expectedHash?: string;
+    actualHash?: string;
+    reason?: string;
+  };
+}
+```
+
+### Where Notifications Fire
+
+| Event | Where | Trigger |
+|-------|-------|---------|
+| `HASH_MISMATCH` | `worker/src/worker.ts` after split | SHA-256 of concatenated split parts != original hash |
+| `MISSING_PART` | Periodic audit job (new) | Group has `partCount > 1` but fewer than `partCount` dest messages exist |
+| `UPLOAD_FAILED` | `worker/src/worker.ts` catch block | Upload fails after all retries exhausted |
+| `DOWNLOAD_FAILED` | `worker/src/worker.ts` catch block | Download fails after all retries |
+| `GROUPING_CONFLICT` | Auto-grouping pass (new) | Two signals suggest different groups for the same package |
+| `INTEGRITY_AUDIT` | Periodic job (new) | Scheduled check finds inconsistencies |
+
+### Delivery
+
+1. **Database:** Always persisted to `SystemNotification` table
+2. **pg_notify:** `SELECT pg_notify('system_notification', jsonPayload)` for real-time
+3. **Web UI:** Notification bell/panel that polls or listens for new notifications
+4. **Telegram (optional):** Forward critical notifications to admin via bot
+
+---
+
+## Deliverable 5: Feature Flag Plan
+
+### Runtime Configuration (Environment Variables)
+
+| Flag | Type | Default | Purpose |
+|------|------|---------|---------|
+| `TELEGRAM_PREMIUM` | boolean | `false` | Enable 4GB upload limit |
+| `MAX_PART_SIZE_MB` | number | `1950` | Split threshold in MiB (overrides hardcoded value) |
+| `AUTO_GROUP_ENABLED` | boolean | `false` | Enable automatic grouping beyond album |
+| `AUTO_GROUP_TIME_WINDOW_MINUTES` | number | `5` | Time-window clustering threshold |
+| `AUTO_GROUP_PATTERN_ENABLED` | boolean | `false` | Enable filename/date pattern grouping |
+| `INTEGRITY_AUDIT_ENABLED` | boolean | `false` | Enable periodic integrity audit |
+| `INTEGRITY_AUDIT_INTERVAL_HOURS` | number | `24` | How often to run the audit |
+
+### Premium Mode Behavior
+
+When `TELEGRAM_PREMIUM=true`:
+1. `MAX_PART_SIZE_MB` defaults to `3900` (safely under 4 GiB) instead of `1950`
+2. Files under 4 GB: uploaded as-is (no splitting)
+3. Files over 4 GB: split using existing `byteLevelSplit()` at the new threshold
+4. Existing split/rejoin logic is **kept as fallback** — never removed
+5. `isMultipart` and `partCount` continue to track actual upload state
+
+### Implementation in `split.ts`:
+
+```typescript
+// Replace hardcoded constant with config-driven:
+const MAX_PART_SIZE = BigInt(config.maxPartSizeMB) * 1024n * 1024n;
+```
+
+And in `config.ts`:
+```typescript
+maxPartSizeMB: parseInt(
+  process.env.MAX_PART_SIZE_MB ??
+    (process.env.TELEGRAM_PREMIUM === "true" ? "3900" : "1950"),
+  10
+),
+```
+
+### Rollout Strategy
+
+1. **All flags default to off** — zero behavior change on deploy
+2. Enable `TELEGRAM_PREMIUM` first (simple, well-understood)
+3. Enable `AUTO_GROUP_ENABLED` on a **per-channel basis** (see test plan) before globally
+4. Enable `INTEGRITY_AUDIT_ENABLED` after manual validation
+5. Pattern-based grouping enabled last (highest complexity)
+
+---
+
+## Deliverable 6: Test Plan
+
+### Phase 0: Pre-Implementation Validation
+
+Before touching any code, verify the current system baseline:
+
+1. **Pick one test channel** with known content (a mix of albums, single files, and multipart archives)
+2. Run an ingestion cycle and record: number of packages, groups, skipped
+3. Verify all album-based groups are correct
+4. Note any ungrouped files that "should" be grouped
+5. This becomes the **regression baseline**
+
+### Phase 1: Premium Mode Testing
+
+1. Set `TELEGRAM_PREMIUM=true` and `MAX_PART_SIZE_MB=3900`
+2. Manually upload a 3 GB test file to a source channel
+3. Trigger ingestion — verify it uploads as a single message (not split)
+4. Manually upload a 5 GB test file
+5. Trigger ingestion — verify it splits at ~3.9 GB threshold
+6. Verify `isMultipart`, `partCount`, `destMessageIds` are correct
+7. Send the package via bot — verify all parts arrive
+
+### Phase 2: Time-Window Grouping Testing
+
+1. Enable `AUTO_GROUP_ENABLED=true` on the test channel only
+2. Post 3 files to the channel within 2 minutes (no album)
+3. Trigger ingestion — verify they auto-group
+4. Post 2 files 10 minutes apart
+5. Trigger ingestion — verify they stay ungrouped
+6. Manually group them — verify `GroupingRule` is created
+7. Post similar files — verify auto-grouping kicks in
+
+### Phase 3: Manual QA via API
+
+Add a **test endpoint** (dev-only) that accepts a fake message payload and runs it through the grouping pipeline without hitting Telegram:
+
+```
+POST /api/dev/test-grouping
+Body: { messages: [...], channelId: "..." }
+Response: { suggestedGroups: [...] }
+```
+
+This allows testing grouping logic against crafted scenarios without waiting for real Telegram messages.
+
+### Phase 4: Integrity Audit Testing
+
+1. Enable `INTEGRITY_AUDIT_ENABLED=true`
+2. Manually corrupt a record (set wrong `contentHash` in DB)
+3. Run audit — verify `HASH_MISMATCH` notification is created
+4. Delete one `destMessageId` from a multipart package's `destMessageIds`
+5. Run audit — verify `MISSING_PART` notification is created
+6. Check notification UI shows both
+
+### Regression Checks After Each Phase
+
+- Re-run ingestion on test channel — same number of packages/groups as baseline
+- Search for known filenames — still returns correct results
+- Send a package via bot — still delivers correctly
+- Album groups unchanged
+- Manual groups unchanged
diff --git a/worker/src/archive/split.ts b/worker/src/archive/split.ts
index f427da9..c065bfe 100644
--- a/worker/src/archive/split.ts
+++ b/worker/src/archive/split.ts
@@ -3,15 +3,19 @@ import { stat } from "fs/promises";
 import path from "path";
 import { pipeline } from "stream/promises";
 import { childLogger } from "../util/logger.js";
+import { config } from "../util/config.js";
 
 const log = childLogger("split");
 
 /**
- * 1950 MiB — safely under Telegram's 2GB upload limit.
- * At exactly 2GiB, TDLib's internal 512KB chunking can exceed Telegram's
+ * Maximum part size for Telegram upload. Configurable via MAX_PART_SIZE_MB env var.
+ * Default: 1950 MiB (safely under 2GB non-Premium limit).
+ * Premium: set to 3900 MiB (safely under 4GB Premium limit).
+ *
+ * At exactly 2/4 GiB, TDLib's internal 512KB chunking can exceed Telegram's
  * 4000-part threshold, causing FILE_PARTS_INVALID errors.
  */
-const MAX_PART_SIZE = 1950n * 1024n * 1024n;
+const MAX_PART_SIZE = BigInt(config.maxPartSizeMB) * 1024n * 1024n;
 
 /**
  * Split a file into ≤2GB parts using byte-level splitting.
diff --git a/worker/src/util/config.ts b/worker/src/util/config.ts
index 665022e..8a8c011 100644
--- a/worker/src/util/config.ts
+++ b/worker/src/util/config.ts
@@ -7,6 +7,9 @@ export const config = {
   logLevel: (process.env.LOG_LEVEL ?? "info") as "debug" | "info" | "warn" | "error",
   telegramApiId: parseInt(process.env.TELEGRAM_API_ID ?? "0", 10),
   telegramApiHash: process.env.TELEGRAM_API_HASH ?? "",
+  /** Maximum file part size for Telegram upload (in MiB). Default 1950 (under 2GB non-Premium limit).
+   *  Set to 3900 for Premium accounts (under 4GB limit). */
+  maxPartSizeMB: parseInt(process.env.MAX_PART_SIZE_MB ?? "1950", 10),
   /** Maximum jitter added to scheduler interval (in minutes) */
   jitterMinutes: 5,
   /** Maximum time span for multipart archive parts (in hours). 0 = no limit. */
diff --git a/worker/src/worker.ts b/worker/src/worker.ts
index 422f9cb..abd0dea 100644
--- a/worker/src/worker.ts
+++ b/worker/src/worker.ts
@@ -1020,7 +1020,7 @@ async function processOneArchiveSet(
       (sum, p) => sum + p.fileSize,
       0n
     );
-    const MAX_UPLOAD_SIZE = 1950n * 1024n * 1024n; // Match split.ts MAX_PART_SIZE
+    const MAX_UPLOAD_SIZE = BigInt(config.maxPartSizeMB) * 1024n * 1024n;
     const hasOversizedPart = archiveSet.parts.some((p) => p.fileSize > MAX_UPLOAD_SIZE);
 
     if (hasOversizedPart) {