docs: add satmachineadmin -> spirekeeper data-migration runbook

SQLite (cp the ext DB file) and Postgres (rename/copy schema) recipes.
Key trap documented: dbversions is keyed by ext id and m001 drops the
legacy v1 tables, so the new install must seed dbversions['spirekeeper']
>= 1 to skip m001 and preserve copied data. Validated on the regtest
dev instance (10 tables, 52 dca_payments etc. preserved across boot).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/migrate-from-satmachineadmin.md

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+# Migrating data: `satmachineadmin` → `spirekeeper`
+
+`spirekeeper` is the v2-bitspire line of the old `satmachineadmin` extension
+split into its own repo, with **both identifiers renamed**:
+
+| Concern        | old (`satmachineadmin`) | new (`spirekeeper`)   |
+|----------------|-------------------------|-----------------------|
+| extension id   | `satmachineadmin`       | `spirekeeper`         |
+| DB name/schema | `satoshimachine`        | `spirekeeper`         |
+| SQLite file    | `ext_satoshimachine.sqlite3` | `ext_spirekeeper.sqlite3` |
+
+The **table layout is identical** — only the schema *alias* changed. So
+migrating an existing install is a data move, not a schema change.
+
+## The one trap: `dbversions` + `m001`'s `DROP TABLE`
+
+`migrations.py:m001` begins by dropping the legacy v1 tables
+(`dca_clients`, `dca_deposits`, `dca_payments`, `lamassu_*`) before
+recreating the v2 schema. On a **fresh** `spirekeeper` install the
+`dbversions` row starts at 0, so the runner executes `m001` — which would
+**drop three tables of any data you just copied in**.
+
+`dbversions` is keyed by **extension id**. An existing `satmachineadmin`
+install that ran the pre-squash staged migrations sits at version **9**
+(`m001`–`m009`), which is why the later squash to a single `m001` never
+re-dropped its data (9 ≥ 1 → skip).
+
+**Therefore: after copying the data, seed `dbversions['spirekeeper']` to
+the old install's version (≥ 1) so the runner skips `m001`.** Match the
+old value (commonly `9`) for fidelity with future migrations.
+
+> `dbversions` lives in the **core** DB (`database.sqlite3` / the core
+> Postgres schema), NOT in the extension DB.
+
+---
+
+## SQLite (default dev + small deployments)
+
+Run with LNbits **stopped** (so neither DB file is open):
+
+```bash
+DATA=/path/to/lnbits/data          # dir holding database.sqlite3 + ext_*.sqlite3
+
+# 1. Copy the extension data file (tables inside are identical).
+cp "$DATA/ext_satoshimachine.sqlite3" "$DATA/ext_spirekeeper.sqlite3"
+
+# 2. Read the old version, seed the new row (upsert) in the CORE db.
+OLDVER=$(sqlite3 "$DATA/database.sqlite3" \
+  "SELECT version FROM dbversions WHERE db='satmachineadmin';")
+sqlite3 "$DATA/database.sqlite3" \
+  "INSERT INTO dbversions (db, version) VALUES ('spirekeeper', $OLDVER)
+   ON CONFLICT(db) DO UPDATE SET version=excluded.version;"
+```
+
+Start LNbits, enable the `spirekeeper` extension — it loads at version
+`$OLDVER`, runs no migration, and sees all rows.
+
+**Rollback:** `rm "$DATA/ext_spirekeeper.sqlite3"` and
+`DELETE FROM dbversions WHERE db='spirekeeper';`. The old install is
+untouched throughout.
+
+---
+
+## Postgres (production)
+
+Both schemas live in the same database. With LNbits stopped:
+
+**Option A — cut over (old extension removed on this instance):**
+
+```sql
+ALTER SCHEMA satoshimachine RENAME TO spirekeeper;
+INSERT INTO dbversions (db, version)
+  SELECT 'spirekeeper', version FROM dbversions WHERE db='satmachineadmin'
+  ON CONFLICT (db) DO UPDATE SET version = excluded.version;
+-- optional: DELETE FROM dbversions WHERE db='satmachineadmin';
+```
+
+**Option B — coexist (both extensions stay enabled):** copy table-by-table
+into a fresh schema instead of renaming:
+
+```sql
+CREATE SCHEMA spirekeeper;
+-- for each table: super_config, dca_machines, dca_clients, dca_lp,
+--   dca_deposits, dca_settlements, dca_commission_splits, dca_payments,
+--   dca_telemetry, cassette_configs
+CREATE TABLE spirekeeper.<t> (LIKE satoshimachine.<t> INCLUDING ALL);
+INSERT INTO spirekeeper.<t> SELECT * FROM satoshimachine.<t>;
+-- then the same dbversions upsert as Option A
+```
+
+Start LNbits, enable `spirekeeper`; `m001` is skipped, data intact.
+
+---
+
+## Verify after migration
+
+Row counts in `ext_spirekeeper` must equal the old install's, and the
+LNbits log must show no `DROP TABLE` for `spirekeeper.*` on boot:
+
+```bash
+sqlite3 "$DATA/ext_spirekeeper.sqlite3" \
+  "SELECT 'dca_payments', COUNT(*) FROM dca_payments
+   UNION ALL SELECT 'dca_settlements', COUNT(*) FROM dca_settlements
+   UNION ALL SELECT 'dca_clients', COUNT(*) FROM dca_clients;"
+```