chore: sync from fn-registry agent

data_http.h

@@ -0,0 +1,76 @@
+#pragma once
+
+// HTTP REST client for sqlite_api /api/datafactory/* endpoints.
+// All calls are blocking; return false on net failure or non-2xx.
+
+#include <string>
+#include <vector>
+
+namespace data_factory {
+
+struct Node {
+    std::string              id;
+    std::string              kind;           // extractor|transformer|database|sink|validator
+    std::string              name;
+    std::string              function_id;
+    std::string              description;
+    std::string              schedule_cron;
+    bool                     enabled = true;
+    std::vector<std::string> tags;
+    std::string              created_at;
+    std::string              updated_at;
+};
+
+struct Run {
+    std::string id;
+    std::string node_id;
+    std::string started_at;
+    std::string finished_at;
+    std::string status;                // running|success|failed|cancelled
+    long long   rows_in     = 0;
+    long long   rows_out    = 0;
+    long long   kb_in       = 0;
+    long long   kb_out      = 0;
+    long long   duration_ms = 0;
+    std::string trigger;
+    std::string error;
+};
+
+struct DatabaseInfo {
+    std::string id;
+    std::string kind;
+    std::string label;
+    std::string uri;
+    std::string description;
+    long long   table_count = 0;
+    long long   size_bytes  = 0;
+    std::string last_seen_at;
+};
+
+// Mirrors dag_engine_ui FnInfo (response shape of GET /api/functions/{id}).
+struct FnInfo {
+    std::string              id;
+    std::string              name;
+    std::string              description;
+    std::string              signature;
+    std::string              purity;
+    std::string              domain;
+    std::string              lang;
+    std::vector<std::string> uses_functions;
+    std::vector<std::string> uses_types;
+};
+
+bool list_nodes_http(const std::string& api_url, const std::string& kind,
+                     std::vector<Node>& out);
+
+bool list_runs_http(const std::string& api_url, const std::string& node_id,
+                    int limit, std::vector<Run>& out);
+
+bool list_databases_http(const std::string& api_url,
+                         std::vector<DatabaseInfo>& out);
+
+bool get_function_http(const std::string& api_url,
+                       const std::string& function_id,
+                       FnInfo& out);
+
+} // namespace data_factory