feat(fusion_accounting_followup): LLM text cache model

Made-with: Cursor

fusion_accounting_followup/models/__init__.py

@@ -1,2 +1,3 @@
 from . import fusion_followup_level
 from . import fusion_followup_run
+from . import fusion_followup_text_cache

fusion_accounting_followup/models/fusion_followup_text_cache.py

@@ -0,0 +1,60 @@
+"""Cache of AI-generated follow-up text to avoid LLM cost on repeats."""
+
+import hashlib
+
+from odoo import _, api, fields, models
+
+
+class FusionFollowupTextCache(models.Model):
+    _name = "fusion.followup.text.cache"
+    _description = "Cache of AI-generated follow-up text"
+    _order = "generated_at desc"
+
+    partner_id = fields.Many2one('res.partner', required=True, ondelete='cascade')
+    level_id = fields.Many2one('fusion.followup.level', ondelete='cascade')
+    company_id = fields.Many2one('res.company', required=True,
+                                 default=lambda self: self.env.company)
+
+    fingerprint = fields.Char(required=True, index=True,
+                              help="SHA-256 of input parameters")
+
+    subject = fields.Char()
+    body = fields.Text()
+    tone_used = fields.Selection([
+        ('gentle', 'Gentle'), ('firm', 'Firm'), ('legal', 'Legal'),
+    ])
+    key_points = fields.Json()
+
+    generated_at = fields.Datetime(default=fields.Datetime.now, required=True)
+    expires_at = fields.Datetime()
+    use_count = fields.Integer(default=0)
+    provider = fields.Char()
+
+    @api.model
+    def compute_fingerprint(self, *, partner_id: int, level_id: int,
+                            overdue_amount: float, longest_overdue_days: int,
+                            invoice_count: int, tone: str) -> str:
+        """Stable hash of the inputs that determine the generated text."""
+        s = f"{partner_id}|{level_id}|{round(overdue_amount, 2)}|" \
+            f"{longest_overdue_days}|{invoice_count}|{tone}"
+        return hashlib.sha256(s.encode('utf-8')).hexdigest()
+
+    @api.model
+    def lookup(self, *, partner_id: int, level_id: int,
+               overdue_amount: float, longest_overdue_days: int,
+               invoice_count: int, tone: str):
+        """Find a cached entry matching these inputs, or empty recordset."""
+        fp = self.compute_fingerprint(
+            partner_id=partner_id, level_id=level_id,
+            overdue_amount=overdue_amount,
+            longest_overdue_days=longest_overdue_days,
+            invoice_count=invoice_count, tone=tone,
+        )
+        return self.search([
+            ('partner_id', '=', partner_id),
+            ('fingerprint', '=', fp),
+        ], limit=1)
+
+    def action_increment_use(self):
+        for rec in self:
+            rec.use_count += 1