lightningd: wait interface for htlcs indexes.

Note that documentation says invoice expiries can batch, but that's no
longer true, so delete it.  Usually, we miss a number because the
change is too fast.

This adds the wait interface, but it doesn't actually fire until the next
commit, which wires it into the db code.

Signed-off-by: Rusty Russell <[email protected]>
Changelog-Added: JSON-RPC: `wait` now supports the `htlcs` (`listhtlcs`) subsystem.

Author: rustyrussell

.msggen.json

@@ -501,6 +501,32 @@
             "offered": 0,
             "settled": 1
         },
+        "WaitHtlcsDirection": {
+            "in": 1,
+            "out": 0
+        },
+        "WaitHtlcsState": {
+            "RCVD_ADD_ACK_COMMIT": 3,
+            "RCVD_ADD_ACK_REVOCATION": 14,
+            "RCVD_ADD_COMMIT": 11,
+            "RCVD_ADD_HTLC": 10,
+            "RCVD_ADD_REVOCATION": 2,
+            "RCVD_REMOVE_ACK_COMMIT": 18,
+            "RCVD_REMOVE_ACK_REVOCATION": 9,
+            "RCVD_REMOVE_COMMIT": 6,
+            "RCVD_REMOVE_HTLC": 5,
+            "RCVD_REMOVE_REVOCATION": 17,
+            "SENT_ADD_ACK_COMMIT": 13,
+            "SENT_ADD_ACK_REVOCATION": 4,
+            "SENT_ADD_COMMIT": 1,
+            "SENT_ADD_HTLC": 0,
+            "SENT_ADD_REVOCATION": 12,
+            "SENT_REMOVE_ACK_COMMIT": 8,
+            "SENT_REMOVE_ACK_REVOCATION": 19,
+            "SENT_REMOVE_COMMIT": 16,
+            "SENT_REMOVE_HTLC": 15,
+            "SENT_REMOVE_REVOCATION": 7
+        },
         "WaitIndexname": {
             "created": 0,
             "deleted": 2,
@@ -518,6 +544,7 @@
         },
         "WaitSubsystem": {
             "forwards": 1,
+            "htlcs": 3,
             "invoices": 0,
             "sendpays": 2
         },
@@ -3671,6 +3698,15 @@
             "Wait.forwards.out_channel": 5,
             "Wait.forwards.status": 1
         },
+        "WaitHtlcs": {
+            "Wait.htlcs.amount_msat": 5,
+            "Wait.htlcs.cltv_expiry": 4,
+            "Wait.htlcs.direction": 6,
+            "Wait.htlcs.htlc_id": 2,
+            "Wait.htlcs.payment_hash": 7,
+            "Wait.htlcs.short_channel_id": 3,
+            "Wait.htlcs.state": 1
+        },
         "WaitInvoices": {
             "Wait.invoices.bolt11": 4,
             "Wait.invoices.bolt12": 5,
@@ -3688,6 +3724,7 @@
             "Wait.deleted": 4,
             "Wait.details": 5,
             "Wait.forwards": 7,
+            "Wait.htlcs": 9,
             "Wait.invoices": 6,
             "Wait.sendpays": 8,
             "Wait.subsystem": 1,
@@ -12805,6 +12842,38 @@
             "added": "v25.05",
             "deprecated": null
         },
+        "Wait.htlcs": {
+            "added": "v25.05",
+            "deprecated": null
+        },
+        "Wait.htlcs.amount_msat": {
+            "added": "v25.05",
+            "deprecated": null
+        },
+        "Wait.htlcs.cltv_expiry": {
+            "added": "v25.05",
+            "deprecated": null
+        },
+        "Wait.htlcs.direction": {
+            "added": "v25.05",
+            "deprecated": null
+        },
+        "Wait.htlcs.htlc_id": {
+            "added": "v25.05",
+            "deprecated": null
+        },
+        "Wait.htlcs.payment_hash": {
+            "added": "v25.05",
+            "deprecated": null
+        },
+        "Wait.htlcs.short_channel_id": {
+            "added": "v25.05",
+            "deprecated": null
+        },
+        "Wait.htlcs.state": {
+            "added": "v25.05",
+            "deprecated": null
+        },
         "Wait.indexname": {
             "added": "pre-v0.10.1",
             "deprecated": null