From 78524414b562633f56b76badc0ff145ecc37736c Mon Sep 17 00:00:00 2001
From: Kevin Heifner <kevin@wire.network>
Date: Mon, 9 Nov 2026 22:39:35 -0500
Subject: [PATCH] Record the envelope epoch on each desyndication return

Each sysio.synd returns row records sent_epoch, the depot epoch of the outbound envelope that carried its DESYNDICATE_LIQ, so a cleanup can expire the row once sysio.msgch's outpcons epoch for the outpost reaches it. sysio.msgch::buildenv sends one inline sysio.synd::retsent with the envelope's epoch and the request ids it shipped; sent_epoch stays 0 while the attestation is queued.

retsent runs inside sysio.epoch::advance and never aborts: an id with no row, a row of another outpost and a row already stamped are dropped with a diagnostic.

Change-Id: Iafa9710093510e9ed967a51a2d5f3ecc7e60d603
---
 .../include/sysio.msgch/sysio.msgch.hpp       |   2 +
 contracts/sysio.msgch/src/sysio.msgch.cpp     |  28 ++-
 contracts/sysio.msgch/sysio.msgch.wasm        | Bin 157765 -> 161562 bytes
 .../include/sysio.synd/sysio.synd.hpp         |  32 ++-
 contracts/sysio.synd/src/sysio.synd.cpp       |  37 +++-
 contracts/sysio.synd/sysio.synd.abi           |  27 +++
 contracts/sysio.synd/sysio.synd.wasm          | Bin 121084 -> 122955 bytes
 contracts/tests/sysio.synd_tests.cpp          | 195 ++++++++++++++++++
 8 files changed, 309 insertions(+), 12 deletions(-)

diff --git a/contracts/sysio.msgch/include/sysio.msgch/sysio.msgch.hpp b/contracts/sysio.msgch/include/sysio.msgch/sysio.msgch.hpp
index e11d93ed00..e2e13b4bf5 100644
--- a/contracts/sysio.msgch/include/sysio.msgch/sysio.msgch.hpp
+++ b/contracts/sysio.msgch/include/sysio.msgch/sysio.msgch.hpp
@@ -166,6 +166,8 @@ namespace sysio {
       /// destination's `sysio.chains` `{kind, external_chain_id}`) so the
       /// receiving outpost can reject an envelope a misconfigured relay
       /// delivered to the wrong same-kind chain.
+      /// When the envelope carries DESYNDICATE_LIQ attestations, sends one inline
+      /// `sysio.synd::retsent` with the envelope's epoch and their request ids.
       [[sysio::action]]
       void buildenv(uint64_t chain_code);
 
diff --git a/contracts/sysio.msgch/src/sysio.msgch.cpp b/contracts/sysio.msgch/src/sysio.msgch.cpp
index b70b4d250e..5a08492e37 100644
--- a/contracts/sysio.msgch/src/sysio.msgch.cpp
+++ b/contracts/sysio.msgch/src/sysio.msgch.cpp
@@ -55,6 +55,9 @@ constexpr auto action_onsynd   = "onsynd"_n;
 constexpr auto action_onyield  = "onyield"_n;
 /// Sent once after the envelope's last attestation, only when one of them reached `sysio.synd`.
 constexpr auto action_closeenv = "closeenv"_n;
+/// Sent once per outbound envelope that carried a DESYNDICATE_LIQ, with the envelope's epoch and the
+/// request ids it carried.
+constexpr auto action_retsent = "retsent"_n;
 } // namespace synd
 
 // System-owned rows bill to the sysio RAM pool, not this contract account (privileged-contract
@@ -469,6 +472,17 @@ bool dispatch_syndicate_liq(name self, const std::vector<char>& data, uint64_t c
    return true;
 }
 
+/// The request id of the DESYNDICATE_LIQ attestation `data`, or `std::nullopt` when the bytes do not decode
+/// or carry no id (0, which the outpost reads as "no id"). `sysio.synd` queues every DESYNDICATE_LIQ with a
+/// nonzero id. Anything else is skipped rather than aborting, because `buildenv` runs inside
+/// `sysio.epoch::advance`.
+std::optional<uint64_t> desyndication_request_id(const std::vector<char>& data) {
+   opp::attestations::DesyndicateLIQ desyndication;
+   auto in = zpp::bits::in{std::span{data.data(), data.size()}, zpp::bits::no_size{}};
+   if (in(desyndication) != zpp::bits::errc{} || desyndication.request_id == 0) return std::nullopt;
+   return desyndication.request_id;
+}
+
 /// LIQ_YIELD: the outpost claimed yield for its syndicated pool since its last report. After the
 /// same checks as a syndication it goes to `sysio.synd::onyield` with the envelope's identity,
 /// which holds the amount as a number until the envelope is underwritten; nothing is minted on this
@@ -1707,9 +1721,15 @@ void msgch::buildenv(uint64_t chain_code) {
    // The shipped rows' bytes are in `packed` now: erase them, and count the general-lane ones out of the
    // outpost's queue. Rows the walk stopped before, or the trim loop popped, stay READY for the next
    // epoch's `buildenv` call.
-   uint32_t general_shipped = 0;
+   uint32_t              general_shipped = 0;
+   std::vector<uint64_t> shipped_returns;
    for (size_t i = 0; i < included_ids.size(); ++i) {
       if (lane_of(entries[i].type) == queue_lane::general) ++general_shipped;
+      if (entries[i].type == AttestationType::ATTESTATION_TYPE_DESYNDICATE_LIQ) {
+         if (const auto request_id = desyndication_request_id(entries[i].data)) {
+            shipped_returns.push_back(*request_id);
+         }
+      }
       atts.erase(id_key{included_ids[i]});
    }
    if (general_shipped > 0) {
@@ -1719,6 +1739,12 @@ void msgch::buildenv(uint64_t chain_code) {
       queue.queued -= std::min(queue.queued, general_shipped);
       queues.set(ram_payer, outbound_queue_key{chain_code}, queue);
    }
+   // sysio.synd records this envelope's epoch on each shipped desyndication's `returns` row. A row can wait
+   // in the queue past several envelopes, so only this build knows which envelope carried it.
+   if (!shipped_returns.empty()) {
+      action(permission_level{get_self(), "active"_n}, synd::account, synd::action_retsent,
+             std::make_tuple(sysio::slug_name{chain_code}, epoch, shipped_returns)).send();
+   }
 
    // This envelope's canonical epoch digest: keccak256 over the packed bytes, which equal the
    // digest preimage because `envelope_hash` is empty on the wire. This is the value the receiving
diff --git a/contracts/sysio.msgch/sysio.msgch.wasm b/contracts/sysio.msgch/sysio.msgch.wasm
index b1f354585464c398aa016531d9eec2b45cd95662..54412faed211008273811b5781254318c491356d 100755
GIT binary patch
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diff --git a/contracts/sysio.synd/include/sysio.synd/sysio.synd.hpp b/contracts/sysio.synd/include/sysio.synd/sysio.synd.hpp
index 1e7ad2476b..77fce33c44 100644
--- a/contracts/sysio.synd/include/sysio.synd/sysio.synd.hpp
+++ b/contracts/sysio.synd/include/sysio.synd/sysio.synd.hpp
@@ -69,6 +69,11 @@
  * flat part covers the external-chain gas the batch operators pay for the round trip. The rest is burned with
  * `sysio.liq::burn`, queued as DESYNDICATE_LIQ to the token's outpost with the next request id, and
  * retained in `returns` until governance establishes its external outcome. The bucket drops by the whole quantity.
+ * `sysio.msgch::buildenv` reports through `retsent` which outbound envelope carried each DESYNDICATE_LIQ,
+ * and the row records that envelope's depot epoch in `sent_epoch`. It stays 0 while the attestation waits
+ * in the outbound queue, which can hold it past several envelopes. The outpost has consumed the row's envelope
+ * once `sysio.msgch`'s `outpcons` epoch for the outpost reaches the row's `sent_epoch`: an outpost emits its
+ * envelope for an epoch only after accepting the depot's.
  * The attestation carries `total_syndicated`, the depot's outstanding shadow of the symbol
  * after the burn (`liq::outstanding_of`), for the outpost's custody check.
  *
@@ -105,12 +110,12 @@
  * Launch. `importsynd` replays pre-launch positions inside the epoch-0 bootstrap window, minting
  * straight to a linked account or into `parked`; `importdone` closes the import for good.
  *
- * Never-throw: `onsynd`, `onyield` and `closeenv` run inside `sysio.msgch`'s consensus transaction.
- * They `check` nothing on their input; a message that fails a rule is dropped with a `DROP`
- * diagnostic on the console and consumes no sequence. The inline `sysio.liq::mint` of a held
- * syndication is sent only after every condition that `mint` checks has been verified here. Receipt
- * actions accept only self-inline calls; the queue step `closeenv` runs keeps the same discipline
- * for every action it sends.
+ * Never-throw: `onsynd`, `onyield` and `closeenv` run inside `sysio.msgch`'s consensus transaction, and
+ * `retsent` inside `sysio.epoch::advance`. They `check` nothing on their input; a message that fails a
+ * rule is dropped with a `DROP` diagnostic on the console and consumes no sequence. The inline
+ * `sysio.liq::mint` of a held syndication is sent only after every condition that `mint` checks has been
+ * verified here. Receipt actions accept only self-inline calls; the queue step `closeenv` runs keeps the
+ * same discipline for every action it sends.
  *
  * Privileged (roa::setsyscode): every row bills the `sysio` RAM pool -- there is no signer to bill on
  * the envelope path -- and inline actions carry this contract's own authority without a
@@ -449,6 +454,15 @@ namespace sysio {
       [[sysio::action, sysio::read_only]]
       desynd_quote quotedesynd(slug_name chain_code, slug_name token_code, uint64_t quantity);
 
+      /// The outbound envelope of outpost `chain_code` built for depot epoch `epoch_index` carried the
+      /// DESYNDICATE_LIQ attestations of `request_ids`. Each listed `returns` row of that outpost records
+      /// `epoch_index` as its `sent_epoch`, once: a row already stamped keeps its epoch. An id with no row (governance has
+      /// resolved it) or whose row belongs to another outpost is dropped with a diagnostic. Sent by
+      /// `sysio.msgch::buildenv` inside `sysio.epoch::advance`, only when the envelope carried a
+      /// DESYNDICATE_LIQ; never throws. Auth=sysio.msgch.
+      [[sysio::action]] void retsent(sysio::slug_name chain_code, uint32_t epoch_index,
+                                        std::vector<uint64_t> request_ids);
+
       // -----------------------------------------------------------------------
       //  Launch ingestion (privileged caller, epoch-0 bootstrap window)
       // -----------------------------------------------------------------------
@@ -658,7 +672,11 @@ namespace sysio {
          opp::types::ChainKind chain_kind; ///< destination key family
          std::vector<char> pubkey; ///< destination captured when queued
          uint64_t amount = 0; ///< exact net burned amount; the fee is not refundable here
-         SYSLIB_SERIALIZE(return_row, (request_id)(holder)(chain_code)(token_code)(chain_kind)(pubkey)(amount))
+         /// Depot epoch of the outbound envelope that carried the DESYNDICATE_LIQ, from `retsent`; 0 until
+         /// that envelope is built. No envelope is built for epoch 0.
+         uint32_t sent_epoch = 0;
+         SYSLIB_SERIALIZE(return_row,
+                          (request_id)(holder)(chain_code)(token_code)(chain_kind)(pubkey)(amount)(sent_epoch))
       };
       /// Outstanding returns only; completed/refunded rows are erased atomically.
       using returns_t = kv::table<"returns"_n, return_key, return_row>;
diff --git a/contracts/sysio.synd/src/sysio.synd.cpp b/contracts/sysio.synd/src/sysio.synd.cpp
index 111824e9f8..60aea87ca4 100644
--- a/contracts/sysio.synd/src/sysio.synd.cpp
+++ b/contracts/sysio.synd/src/sysio.synd.cpp
@@ -128,10 +128,11 @@ constexpr std::string_view desynd_net_message    = "desyndication net of the fee
 constexpr std::string_view desynd_fee_flat_message =
    "flat desyndication fee must fit an asset and be below the minimum desyndication";
 
-/// Diagnostic path names of the intake actions.
-constexpr std::string_view onsynd_path   = "onsynd";
-constexpr std::string_view onyield_path  = "onyield";
-constexpr std::string_view closeenv_path = "closeenv";
+/// Diagnostic path names of the intake actions and of `retsent`.
+constexpr std::string_view onsynd_path     = "onsynd";
+constexpr std::string_view onyield_path    = "onyield";
+constexpr std::string_view closeenv_path   = "closeenv";
+constexpr std::string_view retsent_path = "retsent";
 
 /// Drop reasons, one per rule an intake message can fail.
 constexpr std::string_view pubkey_misfit_reason   = "pubkey does not fit the chain family";
@@ -147,6 +148,11 @@ constexpr std::string_view envelope_closed_reason = "envelope already closed or
 constexpr std::string_view replay_reason          = "replayed sequence";
 constexpr std::string_view digest_reason          = "envelope digest does not match; left OPEN";
 
+/// Why `retsent` left a request id's row as it was.
+constexpr std::string_view return_resolved_reason = "no outstanding return for the request id";
+constexpr std::string_view return_outpost_reason  = "the return belongs to another outpost";
+constexpr std::string_view return_stamped_reason  = "the return already records the envelope that carried it";
+
 /// Why one step of the queue left an envelope or an item where it was.
 constexpr std::string_view no_bond_reason         = "sysio.bond is not deployed; the envelope stays WAITING";
 constexpr std::string_view bond_token_reason      = "sysio.bond cannot bond the token; the envelope stays WAITING";
@@ -1589,6 +1595,29 @@ void synd::desyndicate(name holder, asset quantity, uint64_t max_fee) {
       .send();
 }
 
+void synd::retsent(sysio::slug_name chain_code, uint32_t epoch_index, std::vector<uint64_t> request_ids) {
+   require_auth(MSGCH_ACCOUNT);
+   returns_t pending(get_self());
+   for (const uint64_t request_id : request_ids) {
+      const return_key key{request_id};
+      auto             row = pending.try_get(key);
+      if (!row.has_value()) {
+         drop(retsent_path, return_resolved_reason);
+         continue;
+      }
+      if (row->chain_code != chain_code) {
+         drop(retsent_path, return_outpost_reason);
+         continue;
+      }
+      if (row->sent_epoch != 0) {
+         drop(retsent_path, return_stamped_reason);
+         continue;
+      }
+      row->sent_epoch = epoch_index;
+      pending.set(ram_payer, key, *row);
+   }
+}
+
 // ---------------------------------------------------------------------------
 //  Launch ingestion
 // ---------------------------------------------------------------------------
diff --git a/contracts/sysio.synd/sysio.synd.abi b/contracts/sysio.synd/sysio.synd.abi
index 347ec4af6c..f0125400a1 100644
--- a/contracts/sysio.synd/sysio.synd.abi
+++ b/contracts/sysio.synd/sysio.synd.abi
@@ -906,6 +906,24 @@
                 }
             ]
         },
+        {
+            "name": "retsent",
+            "base": "",
+            "fields": [
+                {
+                    "name": "chain_code",
+                    "type": "slug_name"
+                },
+                {
+                    "name": "epoch_index",
+                    "type": "uint32"
+                },
+                {
+                    "name": "request_ids",
+                    "type": "uint64[]"
+                }
+            ]
+        },
         {
             "name": "return_key",
             "base": "",
@@ -947,6 +965,10 @@
                 {
                     "name": "amount",
                     "type": "uint64"
+                },
+                {
+                    "name": "sent_epoch",
+                    "type": "uint32"
                 }
             ]
         },
@@ -1313,6 +1335,11 @@
             "type": "refundreturn",
             "ricardian_contract": ""
         },
+        {
+            "name": "retsent",
+            "type": "retsent",
+            "ricardian_contract": ""
+        },
         {
             "name": "setconfig",
             "type": "setconfig",
diff --git a/contracts/sysio.synd/sysio.synd.wasm b/contracts/sysio.synd/sysio.synd.wasm
index c29fccfb486c3c94d01de5b7abfa4761a2818c08..19fc19df6e5bcd2fcdb171f96bdc865481d24c41 100755
GIT binary patch
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diff --git a/contracts/tests/sysio.synd_tests.cpp b/contracts/tests/sysio.synd_tests.cpp
index 8078a5645c..3e8ce2c715 100644
--- a/contracts/tests/sysio.synd_tests.cpp
+++ b/contracts/tests/sysio.synd_tests.cpp
@@ -431,6 +431,17 @@ class sysio_synd_tester : public tester {
       return push(SYND_ACCOUNT, synd_abi_ser, signer == name{} ? holder : signer, "desyndicate"_n, mvo()
          ("holder", holder)("quantity", asset(static_cast<int64_t>(amount), sym))("max_fee", max_fee));
    }
+   /// The `sysio.msgch::buildenv` notice that `chain_code`'s envelope of `epoch` carried `request_ids`.
+   action_result retsent(std::string_view chain_code, uint32_t epoch, const std::vector<uint64_t>& request_ids,
+                            name signer = MSGCH_ACCOUNT) {
+      return push(SYND_ACCOUNT, synd_abi_ser, signer, "retsent"_n, mvo()
+         ("chain_code", codename_mvo(chain_code))("epoch_index", epoch)("request_ids", request_ids));
+   }
+   /// Build `chain_code`'s outbound envelope at the depot's current epoch, as `sysio.epoch::advance` does.
+   action_result buildenv(std::string_view chain_code) {
+      return push(MSGCH_ACCOUNT, msgch_abi_ser, EPOCH_ACCOUNT, "buildenv"_n,
+                  mvo()("chain_code", slug_value(chain_code)));
+   }
    /// Query the fee path and retain its return trace, including refusal diagnostics.
    action_result quotedesynd(std::string_view chain, std::string_view token, uint64_t quantity) {
       return push(SYND_ACCOUNT, synd_abi_ser, SYND_ACCOUNT, "quotedesynd"_n, mvo()
@@ -819,6 +830,12 @@ class sysio_synd_tester : public tester {
    fc::variant return_row(uint64_t request_id) {
       return decode(synd_abi_ser, "return_row", get_row_by_id(SYND_ACCOUNT, SYND_ACCOUNT, "returns"_n, request_id));
    }
+   /// The `sent_epoch` of `request_id`'s `returns` row: the epoch of the envelope that carried it, 0 until then.
+   uint32_t sent_epoch(uint64_t request_id) {
+      const auto row = return_row(request_id);
+      BOOST_REQUIRE(!row.is_null());
+      return row["sent_epoch"].as<uint32_t>();
+   }
    fc::variant pool_row(std::string_view token_code) {
       return decode(synd_abi_ser, "pool_row",
                     get_row_by_id(SYND_ACCOUNT, SYND_ACCOUNT, "yieldpool"_n, slug_value(token_code)));
@@ -1597,6 +1614,7 @@ BOOST_FIXTURE_TEST_CASE(outstanding_returns_record_the_original_obligation, sysi
          BOOST_REQUIRE_EQUAL(amount, row["amount"].as_uint64());
          BOOST_REQUIRE_EQUAL("alice", row["holder"].as_string());
          BOOST_REQUIRE_EQUAL(32u, row["pubkey"].as<std::vector<char>>().size());
+         BOOST_REQUIRE_EQUAL(0u, row["sent_epoch"].as<uint32_t>());   // no envelope built yet
       }
    };
    check_log(1, LIQSOL, 10 * UNIT);
@@ -1652,6 +1670,183 @@ BOOST_FIXTURE_TEST_CASE(return_refund_failure_preserves_obligation, sysio_synd_t
    BOOST_REQUIRE_EQUAL(0, liq_balance("alice"_n));
 } FC_LOG_AND_RETHROW()
 
+/// The request ids of the `retsent` notices the last pushed transaction ran, in order.
+std::vector<std::vector<uint64_t>> retsent_notices(sysio_synd_tester& t) {
+   std::vector<std::vector<uint64_t>> notices;
+   if (!t.last_trace) return notices;
+   for (const auto& at : t.last_trace->action_traces) {
+      if (at.receiver != sysio_synd_tester::SYND_ACCOUNT || at.act.account != sysio_synd_tester::SYND_ACCOUNT ||
+          at.act.name != "retsent"_n)
+         continue;
+      const auto data = t.synd_abi_ser.binary_to_variant("retsent", at.act.data,
+                                                         sysio_synd_tester::fixture_abi_yield_function());
+      notices.push_back(data["request_ids"].as<std::vector<uint64_t>>());
+   }
+   return notices;
+}
+
+/// A `returns` row records the epoch of the outbound envelope that carried its DESYNDICATE_LIQ: 0 while the
+/// attestation is queued, then the epoch `buildenv` built the envelope at. Desyndications that ride one
+/// envelope share its epoch; a later envelope's epoch leaves earlier rows as they were.
+BOOST_FIXTURE_TEST_CASE(a_return_records_the_epoch_of_the_envelope_that_carried_it, sysio_synd_tester) try {
+   BOOST_REQUIRE_EQUAL(success(), liq_mint("alice"_n, LIQSOL, 100 * UNIT));
+   BOOST_REQUIRE_EQUAL(success(), link_svm("alice"_n, ed_signer()));
+   BOOST_REQUIRE_EQUAL(success(), setconfig(SOLANA, LIQSOL, {}));
+   BOOST_REQUIRE_EQUAL(success(), set_epoch(3));
+   BOOST_REQUIRE_EQUAL(success(), desyndicate("alice"_n, 10 * UNIT));
+   BOOST_REQUIRE_EQUAL(success(), desyndicate("alice"_n, 7 * UNIT));
+   BOOST_REQUIRE_EQUAL(0u, sent_epoch(1));
+   BOOST_REQUIRE_EQUAL(0u, sent_epoch(2));
+
+   // ETH's envelope ships ETH's own row and none of SOLANA's: no notice, nothing stamped.
+   BOOST_REQUIRE_EQUAL(success(), push(MSGCH_ACCOUNT, msgch_abi_ser, MSGCH_ACCOUNT, "queueout"_n, mvo()
+      ("chain_code", slug_value(ETH))
+      ("attest_type", static_cast<uint32_t>(sysio::opp::types::ATTESTATION_TYPE_OPERATOR_ACTION))
+      ("data", std::vector<char>{'\x01'})));
+   BOOST_REQUIRE(!attestation_row(3).is_null());
+   BOOST_REQUIRE_EQUAL(success(), set_epoch(4));
+   BOOST_REQUIRE_EQUAL(success(), buildenv(ETH));
+   BOOST_REQUIRE(attestation_row(3).is_null());
+   BOOST_REQUIRE(retsent_notices(*this).empty());
+   BOOST_REQUIRE_EQUAL(0u, sent_epoch(1));
+
+   // `advance` builds SOLANA's envelope at the epoch it just started: one notice for both rows.
+   BOOST_REQUIRE_EQUAL(success(), buildenv(SOLANA));
+   BOOST_REQUIRE(attestation_row(1).is_null());
+   BOOST_REQUIRE(attestation_row(2).is_null());
+   BOOST_REQUIRE((retsent_notices(*this) == std::vector<std::vector<uint64_t>>{{1, 2}}));
+   BOOST_REQUIRE_EQUAL(4u, sent_epoch(1));
+   BOOST_REQUIRE_EQUAL(4u, sent_epoch(2));
+
+   // A desyndication in epoch 4 rides the envelope built at epoch 5.
+   BOOST_REQUIRE_EQUAL(success(), desyndicate("alice"_n, 5 * UNIT));
+   BOOST_REQUIRE_EQUAL(0u, sent_epoch(3));
+   BOOST_REQUIRE_EQUAL(success(), set_epoch(5));
+   BOOST_REQUIRE_EQUAL(success(), buildenv(SOLANA));
+   BOOST_REQUIRE((retsent_notices(*this) == std::vector<std::vector<uint64_t>>{{3}}));
+   BOOST_REQUIRE_EQUAL(4u, sent_epoch(1));
+   BOOST_REQUIRE_EQUAL(4u, sent_epoch(2));
+   BOOST_REQUIRE_EQUAL(5u, sent_epoch(3));
+} FC_LOG_AND_RETHROW()
+
+/// Desyndications all queued in epoch 1 spill across three envelopes, and each row records the epoch of the
+/// envelope it actually shipped in. Two desyndications queued back to back land in different envelopes when
+/// the first fills one. The rows between them carry DESYNDICATE_LIQ bytes with no request id: `buildenv`
+/// skips them, and an envelope that carries only such rows sends no notice.
+BOOST_FIXTURE_TEST_CASE(returns_spilled_across_envelopes_record_the_envelope_each_shipped_in,
+                        sysio_synd_tester) try {
+   constexpr uint32_t MAX_ENVELOPE_ATTESTATIONS = 64;   // mirrors sysio.msgch.hpp
+   constexpr uint32_t QUEUEOUTS_PER_BLOCK       = 20;
+   BOOST_REQUIRE_EQUAL(success(), liq_mint("alice"_n, LIQSOL, 100 * UNIT));
+   BOOST_REQUIRE_EQUAL(success(), setconfig(SOLANA, LIQSOL, {}));
+   BOOST_REQUIRE_EQUAL(success(), link_svm("alice"_n, ed_signer()));
+   BOOST_REQUIRE_EQUAL(success(), set_epoch(1));
+
+   // `next_attestation` is the id the next queued attestation takes.
+   uint64_t next_attestation = 1;
+   // Queue `count` rows with no request id.
+   const auto queue_filler = [&](uint32_t count) {
+      for (uint32_t i = 0; i < count; ++i) {
+         BOOST_REQUIRE_EQUAL(success(), push(MSGCH_ACCOUNT, msgch_abi_ser, MSGCH_ACCOUNT, "queueout"_n, mvo()
+            ("chain_code", slug_value(SOLANA))
+            ("attest_type", static_cast<uint32_t>(sysio::opp::types::ATTESTATION_TYPE_DESYNDICATE_LIQ))
+            ("data", std::vector<char>{static_cast<char>(i >> 8), static_cast<char>(i)})));
+         ++next_attestation;
+         if ((i + 1) % QUEUEOUTS_PER_BLOCK == 0) produce_block();
+      }
+      produce_block();
+   };
+   const auto queue_desyndication = [&](uint64_t amount) {
+      BOOST_REQUIRE_EQUAL(success(), desyndicate("alice"_n, amount));
+      BOOST_REQUIRE_EQUAL("ATTESTATION_TYPE_DESYNDICATE_LIQ",
+                          attestation_row(next_attestation)["type"].as_string());
+      ++next_attestation;
+   };
+
+   // Attestations 1-64 are filler; requests 1 and 2 take 65 and 66; filler takes 67-127; requests 3 and 4
+   // take 128 and 129.
+   queue_filler(MAX_ENVELOPE_ATTESTATIONS);
+   queue_desyndication(10 * UNIT);
+   queue_desyndication(5 * UNIT);
+   queue_filler(MAX_ENVELOPE_ATTESTATIONS - 3);
+   queue_desyndication(4 * UNIT);
+   queue_desyndication(3 * UNIT);
+   BOOST_REQUIRE_EQUAL(2 * MAX_ENVELOPE_ATTESTATIONS + 2, next_attestation);
+
+   // The epoch-2 envelope carries only filler.
+   BOOST_REQUIRE_EQUAL(success(), set_epoch(2));
+   BOOST_REQUIRE_EQUAL(success(), buildenv(SOLANA));
+   BOOST_REQUIRE(!executed(SYND_ACCOUNT, "retsent"_n));
+   for (uint64_t id = 1; id <= 4; ++id) BOOST_REQUIRE_EQUAL(0u, sent_epoch(id));
+
+   // The epoch-3 envelope carries requests 1, 2 and 3 and fills before request 4.
+   BOOST_REQUIRE_EQUAL(success(), set_epoch(3));
+   BOOST_REQUIRE_EQUAL(success(), buildenv(SOLANA));
+   BOOST_REQUIRE((retsent_notices(*this) == std::vector<std::vector<uint64_t>>{{1, 2, 3}}));
+   BOOST_REQUIRE_EQUAL(3u, sent_epoch(1));
+   BOOST_REQUIRE_EQUAL(3u, sent_epoch(2));
+   BOOST_REQUIRE_EQUAL(3u, sent_epoch(3));
+   BOOST_REQUIRE_EQUAL(0u, sent_epoch(4));
+   BOOST_REQUIRE(!attestation_row(2 * MAX_ENVELOPE_ATTESTATIONS + 1).is_null());
+
+   BOOST_REQUIRE_EQUAL(success(), set_epoch(4));
+   BOOST_REQUIRE_EQUAL(success(), buildenv(SOLANA));
+   BOOST_REQUIRE((retsent_notices(*this) == std::vector<std::vector<uint64_t>>{{4}}));
+   BOOST_REQUIRE(attestation_row(2 * MAX_ENVELOPE_ATTESTATIONS + 1).is_null());
+   BOOST_REQUIRE_EQUAL(3u, sent_epoch(3));
+   BOOST_REQUIRE_EQUAL(4u, sent_epoch(4));
+} FC_LOG_AND_RETHROW()
+
+/// A return governance resolves before its envelope is built leaves the build whole: the notice for its
+/// request id finds no row and is dropped with a diagnostic.
+BOOST_FIXTURE_TEST_CASE(a_return_resolved_before_its_envelope_is_built_leaves_the_build_whole,
+                        sysio_synd_tester) try {
+   BOOST_REQUIRE_EQUAL(success(), liq_mint("alice"_n, LIQSOL, 100 * UNIT));
+   BOOST_REQUIRE_EQUAL(success(), link_svm("alice"_n, ed_signer()));
+   BOOST_REQUIRE_EQUAL(success(), setconfig(SOLANA, LIQSOL, {}));
+   BOOST_REQUIRE_EQUAL(success(), desyndicate("alice"_n, 10 * UNIT));
+   BOOST_REQUIRE_EQUAL(success(), desyndicate("alice"_n, 5 * UNIT));
+   BOOST_REQUIRE_EQUAL(success(),
+      push(SYND_ACCOUNT, synd_abi_ser, SYSIO_ACCOUNT, "finishreturn"_n, mvo()("request_id", 1)));
+
+   BOOST_REQUIRE_EQUAL(success(), set_epoch(1));
+   BOOST_REQUIRE_EQUAL(success(), buildenv(SOLANA));
+   BOOST_REQUIRE((retsent_notices(*this) == std::vector<std::vector<uint64_t>>{{1, 2}}));
+   BOOST_REQUIRE(console_has("sysio.synd::retsent: DROP -- no outstanding return for the request id"));
+   BOOST_REQUIRE(return_row(1).is_null());
+   BOOST_REQUIRE_EQUAL(1u, sent_epoch(2));
+} FC_LOG_AND_RETHROW()
+
+/// `retsent` is sysio.msgch's alone. It stamps a row once, only for the outpost whose envelope carried
+/// it, and drops every id it cannot stamp without aborting.
+BOOST_FIXTURE_TEST_CASE(retsent_stamps_each_return_once_for_its_own_outpost, sysio_synd_tester) try {
+   BOOST_REQUIRE_EQUAL(success(), liq_mint("alice"_n, LIQSOL, 100 * UNIT));
+   BOOST_REQUIRE_EQUAL(success(), link_svm("alice"_n, ed_signer()));
+   BOOST_REQUIRE_EQUAL(success(), setconfig(SOLANA, LIQSOL, {}));
+   BOOST_REQUIRE_EQUAL(success(), desyndicate("alice"_n, 10 * UNIT));
+
+   BOOST_REQUIRE(mentions(retsent(SOLANA, 7, {1}, "alice"_n), "missing authority of sysio.msgch"));
+   BOOST_REQUIRE(mentions(retsent(SOLANA, 7, {1}, SYND_ACCOUNT), "missing authority of sysio.msgch"));
+   BOOST_REQUIRE_EQUAL(0u, sent_epoch(1));
+
+   BOOST_REQUIRE_EQUAL(success(), retsent(SOLANA, 7, {}));
+   BOOST_REQUIRE_EQUAL(0u, sent_epoch(1));
+
+   BOOST_REQUIRE_EQUAL(success(), retsent(ETH, 7, {1}));
+   BOOST_REQUIRE(console_has("sysio.synd::retsent: DROP -- the return belongs to another outpost"));
+   BOOST_REQUIRE_EQUAL(0u, sent_epoch(1));
+
+   BOOST_REQUIRE_EQUAL(success(), retsent(SOLANA, 7, {99, 1}));
+   BOOST_REQUIRE(console_has("sysio.synd::retsent: DROP -- no outstanding return for the request id"));
+   BOOST_REQUIRE_EQUAL(7u, sent_epoch(1));
+   BOOST_REQUIRE(return_row(99).is_null());
+
+   BOOST_REQUIRE_EQUAL(success(), retsent(SOLANA, 9, {1}));
+   BOOST_REQUIRE(
+      console_has("sysio.synd::retsent: DROP -- the return already records the envelope that carried it"));
+   BOOST_REQUIRE_EQUAL(7u, sent_epoch(1));
+} FC_LOG_AND_RETHROW()
+
 /// The DESYNDICATE_LIQ attestation `id` queued, decoded.
 sysio::opp::attestations::DesyndicateLIQ queued_desyndication(sysio_synd_tester& t, uint64_t id) {
    const auto att = t.attestation_row(id);