blockstorage: Add DeletePruneLock

Also adds basic unit test coverage for prune lock management methods.

src/node/blockstorage.cpp

@@ -404,6 +404,12 @@ void BlockManager::UpdatePruneLock(const std::string& name, const PruneLockInfo&
     m_prune_locks[name] = lock_info;
 }
 
+bool BlockManager::DeletePruneLock(const std::string& name)
+{
+    AssertLockHeld(::cs_main);
+    return m_prune_locks.erase(name) > 0;
+}
+
 CBlockIndex* BlockManager::InsertBlockIndex(const uint256& hash)
 {
     AssertLockHeld(cs_main);

src/node/blockstorage.h

@@ -455,6 +455,9 @@ public:
     //! Create or update a prune lock identified by its name
     void UpdatePruneLock(const std::string& name, const PruneLockInfo& lock_info) EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
 
+    //! Delete a prune lock identified by its name. Returns true if the lock existed.
+    bool DeletePruneLock(const std::string& name) EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
+
     /** Open a block file (blk?????.dat) */
     AutoFile OpenBlockFile(const FlatFilePos& pos, bool fReadOnly) const;
 

src/test/blockmanager_tests.cpp

@@ -300,4 +300,26 @@ BOOST_AUTO_TEST_CASE(blockmanager_flush_block_file)
     BOOST_CHECK_EQUAL(read_block.nVersion, 2);
 }
 
+BOOST_FIXTURE_TEST_CASE(prune_lock_update_and_delete, TestingSetup)
+{
+    LOCK(::cs_main);
+    auto& chainman{*Assert(m_node.chainman)};
+    auto& blockman{chainman.m_blockman};
+
+    // Create a prune lock
+    blockman.UpdatePruneLock("test_lock", node::PruneLockInfo{.height_first = 100});
+
+    // Update it to a new height
+    blockman.UpdatePruneLock("test_lock", node::PruneLockInfo{.height_first = 200});
+
+    // Delete existing prune lock
+    BOOST_CHECK(blockman.DeletePruneLock("test_lock"));
+
+    // Verify deletion worked by trying to delete the same lock again
+    BOOST_CHECK(!blockman.DeletePruneLock("test_lock"));
+
+    // Deleting a non-existent lock returns false
+    BOOST_CHECK(!blockman.DeletePruneLock("nonexistent"));
+}
+
 BOOST_AUTO_TEST_SUITE_END()