[M5+] cargoxx add evicts stale auto-discovered overlay rows

src/linkdb/overlay.cpp

@@ -241,6 +241,28 @@ auto overlay_delete_recipe(OverlayState& state, const std::string& package,
     return {};
 }
 
+auto overlay_evict_auto(OverlayState& state, const std::string& package)
+    -> util::Result<void> {
+    // `manual` rows are user-curated via `cargoxx linkdb add`; everything
+    // else (`nix-probe`, `conan`, `vcpkg`, …) was synthesized by the
+    // resolver from the current cargoxx logic and is safe to drop —
+    // the next add will re-discover with the latest scanner.
+    constexpr const char* SQL =
+        "DELETE FROM recipes WHERE package = ? AND source != 'manual'";
+    sqlite3* db = state.handle();
+    sqlite3_stmt* stmt = nullptr;
+    if (sqlite3_prepare_v2(db, SQL, -1, &stmt, nullptr) != SQLITE_OK) {
+        return std::unexpected(sqlite_error(db, "prepare evict"));
+    }
+    sqlite3_bind_text(stmt, 1, package.c_str(), -1, SQLITE_TRANSIENT);
+    auto rc = sqlite3_step(stmt);
+    sqlite3_finalize(stmt);
+    if (rc != SQLITE_DONE) {
+        return std::unexpected(sqlite_error(db, "step evict"));
+    }
+    return {};
+}
+
 auto overlay_query(OverlayState& state, const std::string& package)
     -> util::Result<std::vector<OverlayRow>> {
     constexpr const char* SQL =
@@ -380,6 +402,14 @@ auto Database::abort_provisional(const std::string& package,
     return detail::overlay_delete_recipe(*overlay_, package, version_range, source);
 }
 
+auto Database::evict_auto_recipes(const std::string& package)
+    -> util::Result<void> {
+    if (auto ok = require_overlay(overlay_); !ok) {
+        return std::unexpected(ok.error());
+    }
+    return detail::overlay_evict_auto(*overlay_, package);
+}
+
 auto Database::set_libcxx_override(const std::string& package,
                                    const std::string& version_range,
                                    const std::string& source, bool value)