Incorporate mark_unconfirmable setting, stub methods.

include/bitcoin/database/impl/query/consensus/consensus_states.ipp

@@ -236,7 +236,8 @@ bool CLASS::set_block_confirmable(const header_link& link) NOEXCEPT
 TEMPLATE
 bool CLASS::set_block_unconfirmable(const header_link& link) NOEXCEPT
 {
-    return set_block_state(link, block_state::unconfirmable);
+    return !store_.mark_unconfirmable() ||
+        set_block_state(link, block_state::unconfirmable);
 }
 
 TEMPLATE

include/bitcoin/database/impl/store/store.ipp

@@ -238,6 +238,12 @@ bool CLASS::turbo() const NOEXCEPT
     return configuration_.turbo;
 }
 
+TEMPLATE
+bool CLASS::mark_unconfirmable() const NOEXCEPT
+{
+    return configuration_.mark_unconfirmable;
+}
+
 TEMPLATE
 uint8_t CLASS::interval_depth() const NOEXCEPT
 {

include/bitcoin/database/query.hpp

@@ -582,6 +582,10 @@ class query
     bool set_signatures(const threshold& group, size_t set,
         const header_link& link) NOEXCEPT;
 
+    // TODO:
+    bool purge_signatures() NOEXCEPT { return {}; };
+    bool verify_signatures(header_links& ) NOEXCEPT { return {}; };
+
     /// Confirmation.
     /// -----------------------------------------------------------------------
     /// These are not used in consensus confirmation.

include/bitcoin/database/settings.hpp

@@ -42,6 +42,9 @@ struct BCD_API settings
     /// Enable concurrency in individual client-server queries.
     bool turbo{ false };
 
+    /// Mark blocks as unconfirmable (disorganize vs. stall).
+    bool mark_unconfirmable{ true };
+
     /// Depth of electrum merkle tree interval caching.
     uint16_t interval_depth{ max_uint8 };
 

include/bitcoin/database/store.hpp

@@ -86,6 +86,9 @@ class store
     /// Allows full throttle concurrent query execution (may use 100% CPU).
     bool turbo() const NOEXCEPT;
 
+    /// Mark blocks as unconfirmable (disorganize vs. stall), configuration.
+    bool mark_unconfirmable() const NOEXCEPT;
+
     /// Depth of electrum merkle tree interval caching.
     uint8_t interval_depth() const NOEXCEPT;
 

test/settings.cpp

@@ -24,6 +24,7 @@ BOOST_AUTO_TEST_CASE(settings__construct__default__expected)
 {
     database::settings configuration;
     BOOST_REQUIRE_EQUAL(configuration.turbo, false);
+    BOOST_REQUIRE_EQUAL(configuration.mark_unconfirmable, true);
     BOOST_REQUIRE_EQUAL(configuration.interval_depth, 255u);
     BOOST_REQUIRE_EQUAL(configuration.path, "bitcoin");