docs: update CLAUDE.md and README to reflect recent changes

- Add reconciled_with_id and created_at columns to transactions table docs
- Document split_payments, expense_metadata, rule_apply_runs tables
- Update /api/transactions route docs with has_split filter and all sort options
- Add /api/transactions/reconcile and /api/split-payments to API table
- Document import date (created_at) behaviour and reconciliation caveat
- Add Prisma regeneration note to CLAUDE.md
- Note schema drift for tables added without migration files

CLAUDE.md

@@ -76,14 +76,25 @@ docker exec postgres-personal psql -U personal -d personal < prisma/migrations/<
 ### Key Tables
 
 - `statements` — one row per billing period per bank account
-- `transactions` — line items; `statement_id` is nullable (NULL = manual entry)
+- `transactions` — line items; `statement_id` is nullable (NULL = manual entry); `reconciled_with_id` links a manual tx to its matched statement tx
 - `transaction_overrides` — user corrections to AI-extracted data (category, merchant, notes)
 - `transaction_splits` — shared expense tracking (participant, share_percent, settled)
+- `split_payments` — recorded cash settlements between participants
 - `transaction_tags` — many-to-many join to `tags`
 - `rules` — auto-categorisation rules (JSONB conditions + actions)
+- `rule_apply_runs` — audit log of bulk rule-apply runs with full snapshot for revert
+- `expense_metadata` — enrichment from email receipts; `transaction_id` nullable until reconciled
 - `participants` — people; `id=1` is "Me" (the primary user)
 - `account_owner_mappings` — persists bank+account → owner assignments
 
+### Import Date (`created_at`)
+
+`transactions.created_at` is the import timestamp (DB default `now()`). In the transactions and shared views, the "Imported" column shows:
+- For statement transactions: when the statement was processed by N8N
+- For reconciled transactions: the `created_at` of the original manual/CSV transaction (via `LEFT JOIN transactions src ON src.reconciled_with_id = t.id`) — so the original import date is preserved post-reconciliation
+
+Use `created_at` (not `transaction_date`) to answer "what was added since the last settlement?". Sort by `created_at` is supported server-side in `getTransactions` and client-side in the shared view.
+
 ### Rules System
 
 Conditions are AND-evaluated. Fields: `merchant_normalized`, `description`, `category`, `bank_name`, `amount`, `transaction_type`. Operators: `contains`, `equals`, `starts_with`, `gt`, `lt`, `not_equals`. Actions: `set_category`, `set_merchant`, `add_tag_ids`, `apply_split`.
@@ -111,6 +122,14 @@ Two files only:
 - Owner filter pattern: `WHERE COALESCE(t.owner_id, s.owner_id) = $1`
 - Bank name pattern: `COALESCE(s.bank_name, 'Manual') as bank_name`
 
+### Prisma
+
+The schema at `prisma/schema.prisma` covers all tables. The generated client (gitignored) must be regenerated after schema changes:
+```bash
+cd /mnt/m2cache/appdata/finance-app && npx prisma generate
+```
+Docker builds run `npx prisma generate` automatically. Do not commit `src/generated/prisma/` — it is gitignored.
+
 ## Known Gaps / TODOs
 
 See `README.md` → **Known Gaps / TODOs** for full details.