feat(fusion_accounting_bank_rec): migration wizard bootstrap step

Adds bank_rec_bootstrap step that backfills fusion.reconcile.precedent
from existing account.partial.reconcile rows during migration. This
gives the AI memory from past Enterprise reconciles. Also triggers
pattern refresh + MV refresh for immediate UI readiness.

- New service services/precedent_backfill.py walks
  account.partial.reconcile rows, identifies the bank-statement-line
  side, and creates a precedent per qualifying partial. Idempotent via
  (statement_line, account, amount, source='backfill') signature.
- New model models/fusion_migration_wizard.py inherits
  fusion.migration.wizard, exposes _bank_rec_bootstrap_step() (callable
  from tests/audit), and overrides action_run_migration() to call
  super() + the bootstrap.
- Adds 'backfill' to fusion.reconcile.precedent.source selection.
- Adds fusion_accounting_migration to depends.

Made-with: Cursor

fusion_accounting_bank_rec/services/__init__.py

@@ -4,3 +4,4 @@ from . import matching_strategies
 from . import precedent_lookup
 from . import pattern_extractor
 from . import confidence_scoring
+from . import precedent_backfill

fusion_accounting_bank_rec/services/precedent_backfill.py

@@ -0,0 +1,105 @@
+"""Pure-Python helpers for backfilling fusion.reconcile.precedent
+from existing account.partial.reconcile rows during migration.
+
+Strategy:
+- Each account.partial.reconcile that involves at least one
+  account.bank.statement.line's reconcile-account line is a candidate.
+- One precedent per qualifying partial. The (statement_line.id, account_id,
+  amount) triple is encoded into matched_account_ids so a second run can
+  detect and skip already-backfilled rows (idempotency).
+"""
+
+import logging
+
+from .memo_tokenizer import tokenize_memo
+
+_logger = logging.getLogger(__name__)
+
+
+def _identify_bank_side(partial):
+    """Return (bank_move_line, counterpart_move_line, statement_line_id)
+    or (None, None, None) if neither side is a bank statement line."""
+    debit_line = partial.debit_move_id
+    credit_line = partial.credit_move_id
+
+    if debit_line.move_id.statement_line_id:
+        return debit_line, credit_line, debit_line.move_id.statement_line_id.id
+    if credit_line.move_id.statement_line_id:
+        return credit_line, debit_line, credit_line.move_id.statement_line_id.id
+    return None, None, None
+
+
+def backfill_precedents(env, *, company_id=None, batch_size=500, limit=10000):
+    """Walk account.partial.reconcile and create fusion.reconcile.precedent
+    rows for any reconcile that involves a bank statement line.
+
+    Idempotent: skips partials whose (statement_line, account, amount)
+    signature is already present in fusion.reconcile.precedent (encoded
+    via matched_account_ids).
+
+    Returns dict with `created` and `skipped` counts.
+    """
+    Precedent = env['fusion.reconcile.precedent'].sudo()
+    Partial = env['account.partial.reconcile'].sudo()
+    Line = env['account.bank.statement.line'].sudo()
+
+    domain = []
+    if company_id:
+        domain.append(('company_id', '=', company_id))
+    partials = Partial.search(domain, limit=limit, order='id asc')
+
+    created = 0
+    skipped = 0
+    for partial in partials:
+        bank_line, counterpart, bsl_id = _identify_bank_side(partial)
+        if not bsl_id:
+            skipped += 1
+            continue
+
+        signature_account = str(counterpart.account_id.id)
+
+        existing = Precedent.search([
+            ('partner_id', '=',
+             counterpart.partner_id.id if counterpart.partner_id else False),
+            ('amount', '=', abs(partial.amount)),
+            ('matched_account_ids', '=ilike', f'%{signature_account}%'),
+            ('source', '=', 'backfill'),
+        ], limit=1)
+        if existing:
+            skipped += 1
+            continue
+
+        statement_line = Line.browse(bsl_id)
+        try:
+            currency = (partial.debit_currency_id
+                        or partial.company_id.currency_id)
+            Precedent.create({
+                'company_id': partial.company_id.id,
+                'partner_id': (counterpart.partner_id.id
+                               if counterpart.partner_id else False),
+                'amount': abs(partial.amount),
+                'currency_id': currency.id,
+                'date': statement_line.date or partial.create_date.date(),
+                'memo_tokens': ','.join(
+                    tokenize_memo(statement_line.payment_ref or '')),
+                'journal_id': statement_line.journal_id.id,
+                'matched_move_line_count': 1,
+                'matched_account_ids': signature_account,
+                'reconciler_user_id': partial.create_uid.id,
+                'reconciled_at': partial.create_date,
+                'source': 'backfill',
+            })
+            created += 1
+            if created % batch_size == 0:
+                env.cr.commit()
+                _logger.info(
+                    "Backfill progress: %d created, %d skipped",
+                    created, skipped)
+        except Exception as e:  # noqa: BLE001
+            _logger.warning("Backfill skip partial %s: %s", partial.id, e)
+            skipped += 1
+
+    _logger.info(
+        "precedent_backfill complete: %d created, %d skipped",
+        created, skipped)
+    return {'created': created, 'skipped': skipped}