feat: data layer HTTP — consume sqlite_api en vez de SQLite directo

Nuevo data_http.cpp que obtiene todos los datos del registry via HTTP
POST a sqlite_api (/api/databases/registry/query). Mismas queries SQL
que el data layer SQLite pero ejecutadas remotamente. cpp-httplib como
cliente HTTP, nlohmann/json para parsear respuestas.

CMakeLists.txt actualizado: incluye data_http.cpp, vendor/ en includes,
linkea pthreads (Linux) y ws2_32 (Windows) para sockets.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CMakeLists.txt

@@ -17,6 +17,7 @@ endif()
 add_imgui_app(registry_dashboard
     main.cpp
     data.cpp
+    data_http.cpp
     views.cpp
     ${CMAKE_SOURCE_DIR}/functions/viz/kpi_card.cpp
     ${CMAKE_SOURCE_DIR}/functions/viz/bar_chart.cpp
@@ -31,6 +32,18 @@ add_imgui_app(registry_dashboard
 
 target_include_directories(registry_dashboard PRIVATE
     ${CMAKE_CURRENT_SOURCE_DIR}
+    ${CMAKE_CURRENT_SOURCE_DIR}/vendor
 )
 
 target_link_libraries(registry_dashboard PRIVATE SQLite::SQLite3)
+
+# cpp-httplib needs threads on Linux
+if(UNIX)
+    find_package(Threads REQUIRED)
+    target_link_libraries(registry_dashboard PRIVATE Threads::Threads)
+endif()
+
+# On Windows cross-compile, link ws2_32 for sockets
+if(WIN32)
+    target_link_libraries(registry_dashboard PRIVATE ws2_32)
+endif()

data_http.cpp

@@ -0,0 +1,202 @@
+#include "data_http.h"
+
+#define CPPHTTPLIB_OPENSSL_SUPPORT 0
+#include "vendor/httplib.h"
+#include "vendor/nlohmann/json.hpp"
+
+#include <cstdio>
+
+using json = nlohmann::json;
+
+// POST a SQL query to the API and return parsed JSON, or null on failure.
+static json api_query(httplib::Client& cli, const char* sql) {
+    json body;
+    body["sql"] = sql;
+    auto res = cli.Post("/api/databases/registry/query",
+                        body.dump(), "application/json");
+    if (!res || res->status != 200) {
+        if (res) fprintf(stderr, "[http] query error %d: %s\n", res->status, res->body.c_str());
+        else     fprintf(stderr, "[http] connection failed for query: %s\n", sql);
+        return nullptr;
+    }
+    return json::parse(res->body, nullptr, false);
+}
+
+// Extract first int from a single-row, single-column result.
+static int extract_int(const json& j) {
+    if (j.is_null() || !j.contains("rows") || j["rows"].empty())
+        return 0;
+    auto& val = j["rows"][0][0];
+    if (val.is_number()) return val.get<int>();
+    if (val.is_string()) return std::atoi(val.get<std::string>().c_str());
+    return 0;
+}
+
+// Extract string from a row at given column index.
+static std::string extract_str(const json& row, size_t idx) {
+    if (idx >= row.size() || row[idx].is_null()) return "";
+    if (row[idx].is_string()) return row[idx].get<std::string>();
+    return row[idx].dump();
+}
+
+// Extract int from a row at given column index.
+static int extract_row_int(const json& row, size_t idx) {
+    if (idx >= row.size() || row[idx].is_null()) return 0;
+    if (row[idx].is_number()) return row[idx].get<int>();
+    if (row[idx].is_string()) return std::atoi(row[idx].get<std::string>().c_str());
+    return 0;
+}
+
+bool load_registry_data_http(const std::string& api_url, RegistryData& out) {
+    httplib::Client cli(api_url);
+    cli.set_connection_timeout(2);
+    cli.set_read_timeout(5);
+
+    // Health check first
+    auto health = cli.Get("/health");
+    if (!health || health->status != 200) {
+        fprintf(stderr, "[http] sqlite_api not reachable at %s\n", api_url.c_str());
+        return false;
+    }
+
+    fprintf(stdout, "[http] Connected to sqlite_api at %s\n", api_url.c_str());
+
+    // --- Counts ---
+    auto j = api_query(cli, "SELECT COUNT(*) FROM functions");
+    out.stats.total_functions = extract_int(j);
+
+    j = api_query(cli, "SELECT COUNT(*) FROM types");
+    out.stats.total_types = extract_int(j);
+
+    j = api_query(cli, "SELECT COUNT(*) FROM apps");
+    out.stats.total_apps = extract_int(j);
+
+    j = api_query(cli, "SELECT COUNT(*) FROM analysis");
+    out.stats.total_analysis = extract_int(j);
+
+    j = api_query(cli, "SELECT COUNT(*) FROM unit_tests");
+    out.stats.total_unit_tests = extract_int(j);
+
+    j = api_query(cli, "SELECT COUNT(*) FROM proposals");
+    out.stats.total_proposals = extract_int(j);
+
+    j = api_query(cli, "SELECT COUNT(*) FROM functions WHERE tested = 1");
+    out.stats.tested_functions = extract_int(j);
+
+    j = api_query(cli, "SELECT COUNT(*) FROM functions WHERE purity = 'pure'");
+    out.stats.pure_functions = extract_int(j);
+
+    j = api_query(cli, "SELECT COUNT(*) FROM functions WHERE purity = 'impure'");
+    out.stats.impure_functions = extract_int(j);
+
+    // --- By language ---
+    out.by_lang.clear();
+    j = api_query(cli, "SELECT lang, COUNT(*) as cnt FROM functions GROUP BY lang ORDER BY cnt DESC");
+    if (!j.is_null() && j.contains("rows")) {
+        for (auto& row : j["rows"]) {
+            out.by_lang.push_back({extract_str(row, 0), extract_row_int(row, 1)});
+        }
+    }
+
+    // --- By domain ---
+    out.by_domain.clear();
+    j = api_query(cli, "SELECT domain, COUNT(*) as cnt FROM functions GROUP BY domain ORDER BY cnt DESC");
+    if (!j.is_null() && j.contains("rows")) {
+        for (auto& row : j["rows"]) {
+            out.by_domain.push_back({extract_str(row, 0), extract_row_int(row, 1)});
+        }
+    }
+
+    // --- By kind ---
+    out.by_kind.clear();
+    j = api_query(cli, "SELECT kind, COUNT(*) as cnt FROM functions GROUP BY kind ORDER BY cnt DESC");
+    if (!j.is_null() && j.contains("rows")) {
+        for (auto& row : j["rows"]) {
+            out.by_kind.push_back({extract_str(row, 0), extract_row_int(row, 1)});
+        }
+    }
+
+    // --- By date (last 30 days) ---
+    out.by_date.clear();
+    j = api_query(cli,
+        "SELECT date(created_at) as d, COUNT(*) as cnt FROM functions "
+        "WHERE created_at >= date('now', '-30 days') GROUP BY d ORDER BY d");
+    if (!j.is_null() && j.contains("rows")) {
+        for (auto& row : j["rows"]) {
+            out.by_date.push_back({extract_str(row, 0), extract_row_int(row, 1)});
+        }
+    }
+
+    // --- Recent functions (last 20) ---
+    out.recent_funcs.clear();
+    j = api_query(cli,
+        "SELECT id, name, lang, domain, kind, purity, description, created_at, tested "
+        "FROM functions ORDER BY created_at DESC LIMIT 20");
+    if (!j.is_null() && j.contains("rows")) {
+        for (auto& row : j["rows"]) {
+            FunctionRow r;
+            r.id = extract_str(row, 0);
+            r.name = extract_str(row, 1);
+            r.lang = extract_str(row, 2);
+            r.domain = extract_str(row, 3);
+            r.kind = extract_str(row, 4);
+            r.purity = extract_str(row, 5);
+            r.description = extract_str(row, 6);
+            r.created_at = extract_str(row, 7);
+            r.tested = extract_row_int(row, 8) != 0;
+            out.recent_funcs.push_back(std::move(r));
+        }
+    }
+
+    // --- Apps ---
+    out.apps.clear();
+    j = api_query(cli,
+        "SELECT id, name, lang, domain, description, framework FROM apps ORDER BY name");
+    if (!j.is_null() && j.contains("rows")) {
+        for (auto& row : j["rows"]) {
+            AppRow r;
+            r.id = extract_str(row, 0);
+            r.name = extract_str(row, 1);
+            r.lang = extract_str(row, 2);
+            r.domain = extract_str(row, 3);
+            r.description = extract_str(row, 4);
+            r.framework = extract_str(row, 5);
+            out.apps.push_back(std::move(r));
+        }
+    }
+
+    // --- Analysis ---
+    out.analyses.clear();
+    j = api_query(cli,
+        "SELECT id, name, domain, description FROM analysis ORDER BY name");
+    if (!j.is_null() && j.contains("rows")) {
+        for (auto& row : j["rows"]) {
+            AnalysisRow r;
+            r.id = extract_str(row, 0);
+            r.name = extract_str(row, 1);
+            r.domain = extract_str(row, 2);
+            r.description = extract_str(row, 3);
+            out.analyses.push_back(std::move(r));
+        }
+    }
+
+    // --- Types ---
+    out.types.clear();
+    j = api_query(cli,
+        "SELECT id, name, lang, domain, algebraic, description FROM types ORDER BY name");
+    if (!j.is_null() && j.contains("rows")) {
+        for (auto& row : j["rows"]) {
+            TypeRow r;
+            r.id = extract_str(row, 0);
+            r.name = extract_str(row, 1);
+            r.lang = extract_str(row, 2);
+            r.domain = extract_str(row, 3);
+            r.algebraic = extract_str(row, 4);
+            r.description = extract_str(row, 5);
+            out.types.push_back(std::move(r));
+        }
+    }
+
+    out.prepare_chart_data();
+    return true;
+}

data_http.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include "data.h"
+#include <string>
+
+// Load all registry data via sqlite_api HTTP endpoint.
+// api_url should be like "http://127.0.0.1:8484".
+// Returns true on success.
+bool load_registry_data_http(const std::string& api_url, RegistryData& out);