started adding mint stuff

lnbits/extensions/cashu/crud.py

@@ -68,3 +68,62 @@ async def get_cashus(wallet_ids: Union[str, List[str]]) -> List[Cashu]:
 
 async def delete_cashu(cashu_id: str) -> None:
     await db.execute("DELETE FROM cashu.cashu WHERE id = ?", (cashu_id,))
+
+
+
+###############MINT STUFF#################
+
+async def store_promise(
+    amount: int,
+    B_: str,
+    C_: str,
+    db: Database,
+    conn: Optional[Connection] = None,
+):
+
+    await (conn or db).execute(
+        """
+        INSERT INTO promises
+          (amount, B_b, C_b)
+        VALUES (?, ?, ?)
+        """,
+        (
+            amount,
+            str(B_),
+            str(C_),
+        ),
+    )
+
+
+async def get_proofs_used(
+    db: Database,
+    conn: Optional[Connection] = None,
+):
+
+    rows = await (conn or db).fetchall(
+        """
+        SELECT secret from proofs_used
+        """
+    )
+    return [row[0] for row in rows]
+
+
+async def invalidate_proof(
+    proof: Proof,
+    db: Database,
+    conn: Optional[Connection] = None,
+):
+
+    # we add the proof and secret to the used list
+    await (conn or db).execute(
+        """
+        INSERT INTO proofs_used
+          (amount, C, secret)
+        VALUES (?, ?, ?)
+        """,
+        (
+            proof.amount,
+            str(proof.C),
+            str(proof.secret),
+        ),
+    )