From 7bdc8773a21916904474830f1066ca24c20f99b1 Mon Sep 17 00:00:00 2001
From: Eric Voskuil <eric@voskuil.org>
Date: Sat, 17 Oct 2026 17:42:11 -0400
Subject: [PATCH] Prune on startup when coalesced.

---
 src/chasers/chaser_snapshot.cpp  | 26 ++++++++++++++++++++++++++
 test/chasers/chaser_estimate.cpp | 23 ++++++++++++++++++++++-
 2 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/src/chasers/chaser_snapshot.cpp b/src/chasers/chaser_snapshot.cpp
index cbb52992..3b8149c2 100644
--- a/src/chasers/chaser_snapshot.cpp
+++ b/src/chasers/chaser_snapshot.cpp
@@ -65,6 +65,32 @@ code chaser_snapshot::start() NOEXCEPT
     ////if (enabled_confirm_)
     ////    confirm_ = std::max(archive().get_top_confirmed(), checkpoint());
 
+    // Prune on startup when coalesced above genesis, before the network starts.
+    const auto& query = archive();
+    if (!is_zero(query.get_top_confirmed()) && query.is_coalesced())
+    {
+        LOG_ONLY(const auto begin = logger::now();)
+        if (const auto ec = query.prune([this](auto LOG_ONLY(event_),
+            auto LOG_ONLY(table)) NOEXCEPT
+        {
+            LOGN("snapshot::" << full_node::store::events.at(event_)
+                << "(" << full_node::store::tables.at(table) << ")");
+        }))
+        {
+            LOGF("Prune deferred, " << ec.message());
+        }
+        else
+        {
+            pruned_.store(true, std::memory_order_relaxed);
+            const header_t top = query.to_confirmed(query.get_top_confirmed());
+            notify(error::success, chases::pruned{ top });
+            LOG_ONLY(const auto time = logger::now() - begin;)
+            LOG_ONLY(const auto span = duration_cast<milliseconds>(time);)
+            LOGN("Pruned prevout cache at height [" << query.get_top_confirmed()
+                << "] complete in " << span.count() << " msecs.");
+        }
+    }
+
     SUBSCRIBE_CHASE(handle_chase, _1, _2);
     return error::success;
 }
diff --git a/test/chasers/chaser_estimate.cpp b/test/chasers/chaser_estimate.cpp
index 62a6c766..1584c025 100644
--- a/test/chasers/chaser_estimate.cpp
+++ b/test/chasers/chaser_estimate.cpp
@@ -44,6 +44,18 @@ struct chaser_estimate_setup_fixture
             query.push_confirmed(query.to_header(block1.hash()), true);
     }
 
+    // Mainnet block 1 is a candidate, so the store is not coalesced.
+    static bool candidate1(node::query& query) NOEXCEPT
+    {
+        const system::settings bitcoin{ chain::selection::mainnet };
+        const auto& genesis = bitcoin.genesis_block.header();
+        const auto& block1 = p2p_compact_setup_fixture::block1();
+        const database::context context1{ 0, 1, genesis.timestamp() };
+        const auto work1 = genesis.proof() + block1.header().proof();
+        return query.set(block1, context1, work1, false, true) &&
+            query.push_candidate(query.to_header(block1.hash()));
+    }
+
     inline chaser_estimate_setup_fixture(uint16_t horizon,
         const initializer& setup=confirm1)
       : p2p_setup_fixture(setup, [=](configuration& config)
@@ -166,6 +178,15 @@ struct chaser_estimate_enabled_setup_fixture
     }
 };
 
+struct chaser_estimate_uncoalesced_setup_fixture
+  : chaser_estimate_setup_fixture
+{
+    inline chaser_estimate_uncoalesced_setup_fixture()
+      : chaser_estimate_setup_fixture(2, candidate1)
+    {
+    }
+};
+
 BC_POP_WARNING()
 
 BOOST_AUTO_TEST_SUITE(chaser_estimate_tests)
@@ -176,7 +197,7 @@ BOOST_FIXTURE_TEST_CASE(chaser_estimate__estimate__disabled__estimate_disabled,
     BOOST_REQUIRE_EQUAL(result.first, node::error::estimate_disabled);
 }
 
-BOOST_FIXTURE_TEST_CASE(chaser_estimate__estimate__not_initialized__estimate_premature, chaser_estimate_enabled_setup_fixture)
+BOOST_FIXTURE_TEST_CASE(chaser_estimate__estimate__not_initialized__estimate_premature, chaser_estimate_uncoalesced_setup_fixture)
 {
     const auto result = estimate(1, estimator::mode::basic);
     BOOST_REQUIRE_EQUAL(result.first, node::error::estimate_premature);