diff --git a/COMMIT_EDITMSG b/COMMIT_EDITMSG
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+++ /dev/null
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-Improve ZXDB downloads with local mirroring and inline preview
-
-This commit implements a comprehensive local file mirror system for
-ZXDB and WoS downloads, allowing users to access local archives
-directly through the explorer UI.
-
-Key Changes:
-
-Local File Mirroring & Proxy:
-- Added `ZXDB_LOCAL_FILEPATH` and `WOS_LOCAL_FILEPATH` to `src/env.ts`
-  and `example.env` for opt-in local mirroring.
-- Implemented `resolveLocalLink` in `src/server/repo/zxdb.ts` to map
-  database `file_link` paths to local filesystem paths based on
-  configurable prefixes.
-- Created `src/app/api/zxdb/download/route.ts` to safely proxy local
-  files, preventing path traversal and serving with appropriate
-  `Content-Type` and `Content-Disposition`.
-- Updated `docs/ZXDB.md` with setup instructions and resolution logic.
-
-UI Enhancements & Grouping:
-- Grouped downloads and scraps by type (e.g., Inlay, Game manual, Tape
-  image) in `EntryDetail.tsx` and `ReleaseDetail.tsx` for better
-  organization.
-- Introduced `FileViewer.tsx` component to provide inline previews
-  for supported formats (.txt, .nfo, .png, .jpg, .gif, .pdf).
-- Added a "Preview" button for local mirrors of supported file types.
-- Optimized download tables with badge-style links for local/remote
-  sources.
-
-Guideline Updates:
-- Updated `AGENTS.md` to clarify commit message handling: edit or
-  append to `COMMIT_EDITMSG` instead of overwriting.
-- Re-emphasized testing rules: use `tsc --noEmit`, do not restart
-  dev-server, and avoid `pnpm build` during development.
-
-Signed-off-by: junie@lucy.xalior.com
diff --git a/docs/plans/software-hashes.md b/docs/plans/software-hashes.md
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+# Software Hashes Plan
+
+Plan for adding a derived `software_hashes` table, its update pipeline, and JSON snapshot lifecycle to survive DB wipes.
+
+---
+
+## 1) Goals and Scope (Plan Step 1)
+
+- Create and maintain `software_hashes` for (at this stage) tape-image downloads.
+- Preserve existing `_CONTENTS` folders; only create missing ones.
+- Export `software_hashes` to JSON after each bulk update.
+- Reimport `software_hashes` JSON during DB wipe in `bin/import_mysql.sh` (or a helper script it invokes).
+- Ensure all scripts are idempotent and resume-safe.
+
+---
+
+## 2) Confirm Pipeline Touchpoints (Plan Step 2)
+
+- Verify `bin/import_mysql.sh` is the authoritative DB wipe/import entry point.
+- Confirm `bin/sync-downloads.mjs` remains responsible only for CDN cache sync.
+- Confirm `src/server/schema/zxdb.ts` uses `downloads.id` as the natural FK target.
+
+---
+
+## 3) Define Data Model: `software_hashes` (Plan Step 3)
+
+### Table naming and FK alignment
+
+- Table: `software_hashes`.
+- FK: `download_id` → `downloads.id`.
+- Column names follow existing DB `snake_case` conventions.
+
+### Planned columns
+
+- `download_id` (PK or unique index; FK to `downloads.id`)
+- `md5`
+- `crc32`
+- `size_bytes`
+- `updated_at`
+
+### Planned indexes / constraints
+
+- Unique index on `download_id`.
+- Index on `md5` for reverse lookup.
+- Index on `crc32` for reverse lookup.
+
+---
+
+## 4) Define JSON Snapshot Format (Plan Step 4)
+
+### Location
+
+- Default: `data/zxdb/software_hashes.json` (or another agreed path).
+
+### Structure
+
+```json
+{
+  "exportedAt": "2026-02-17T15:18:00.000Z",
+  "rows": [
+    {
+      "download_id": 123,
+      "md5": "...",
+      "crc32": "...",
+      "size_bytes": 12345,
+      "updated_at": "2026-02-17T15:18:00.000Z"
+    }
+  ]
+}
+```
+
+### Planned import policy
+
+- If snapshot exists: truncate `software_hashes` and bulk insert.
+- If snapshot missing: log and continue without error.
+
+---
+
+## 5) Implement Tape Image Update Workflow (Plan Step 5)
+
+### Planned script
+
+- `bin/update-software-hashes.mjs` (name can be adjusted).
+
+### Planned input dataset
+
+- Query `downloads` for tape-image rows (filter by `filetype_id` or joined `filetypes` table).
+
+### Planned per-item process
+
+1. Resolve local zip path using the same CDN mapping used by `sync-downloads`.
+2. Compute `_CONTENTS` folder name: `<zip filename>_CONTENTS` (exact match).
+3. If `_CONTENTS` exists, keep it untouched.
+4. If missing, extract zip into `_CONTENTS` using a library that avoids shell expansion issues with brackets.
+5. Locate tape file inside (`.tap`, `.tzx`, `.pzx`, `.csw`):
+   - Apply a deterministic priority order.
+   - If multiple candidates remain, log and skip (or record ambiguity).
+6. Compute `md5`, `crc32`, and `size_bytes` for the selected file.
+7. Upsert into `software_hashes` keyed by `download_id`.
+
+### Planned error handling
+
+- Log missing zips or missing tape files.
+- Continue after recoverable errors; fail only on critical DB errors.
+
+---
+
+## 6) Implement JSON Export Lifecycle (Plan Step 6)
+
+- After each bulk update, export `software_hashes` to JSON.
+- Write atomically (temp file + rename).
+- Include `exportedAt` timestamp in snapshot.
+
+---
+
+## 7) Reimport During Wipe (`bin/import_mysql.sh`) (Plan Step 7)
+
+### Planned placement
+
+- Immediately after database creation and ZXDB SQL import completes.
+
+### Planned behavior
+
+- Attempt to read JSON snapshot.
+- If present, truncate and reinsert `software_hashes`.
+- Log imported row count.
+
+---
+
+## 8) Add Idempotency and Resume Support (Plan Step 8)
+
+- State file similar to `.sync-downloads.state.json` to track last `download_id` processed.
+- CLI flags:
+  - `--resume` (default)
+  - `--start-from-id`
+  - `--rebuild-all`
+- Reprocess when zip file size or mtime changes.
+
+---
+
+## 9) Validation Checklist (Plan Step 9)
+
+- `_CONTENTS` folders are never deleted.
+- Hashes match expected MD5/CRC32 for known samples.
+- JSON snapshot is created and reimported correctly.
+- Reverse lookup by `md5`/`crc32`/`size_bytes` identifies misnamed files.
+- Script can resume safely after interruption.
+
+---
+
+## 10) Open Questions / Confirmations (Plan Step 10)
+
+- Final `software_hashes` column list and types.
+- Exact JSON snapshot path.
+- Filetype IDs that map to “Tape Image” in `downloads`.
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