overview: one endpoint, live projections and a response cache (m36)

src/web/routes.zig

@@ -45,11 +45,11 @@ const local = @import("handlers/local.zig");
 const lookup = @import("handlers/lookup.zig");
 const metrics = @import("metrics.zig");
 const openapi = @import("openapi.zig");
+const overview = @import("handlers/overview.zig");
 const pause = @import("handlers/pause.zig");
 const queries = @import("handlers/queries.zig");
 const rules = @import("handlers/rules.zig");
 const settings = @import("handlers/settings.zig");
-const stats = @import("handlers/stats.zig");
 const upstreams = @import("handlers/upstreams.zig");
 const version = @import("handlers/version.zig");
 
@@ -64,18 +64,14 @@ pub const table: []const router.RouteInfo = &.{
     .{ .method = .POST, .pattern = "/api/auth/login", .auth = .open, .policy = .runtime_action, .handler = auth.login },
     .{ .method = .POST, .pattern = "/api/auth/logout", .auth = .session, .policy = .runtime_action, .handler = auth.logout },
 
-    // Query log, stats, live stream, lookup.
+    // Query log, overview, live stream, lookup.
     .{ .method = .GET, .pattern = "/api/queries", .auth = .session, .policy = .read, .handler = queries.list },
     .{ .method = .GET, .pattern = "/api/queries/live", .auth = .session, .policy = .read, .handler = live.stream, .rate_limit = .exempt },
     // Listed after the literal `live`, which a linear first-match scan reaches
     // first — though `{id}` would refuse it anyway, since it captures a
     // positive integer and nothing else.
     .{ .method = .GET, .pattern = "/api/queries/{id}", .auth = .session, .policy = .read, .handler = queries.detail },
-    .{ .method = .GET, .pattern = "/api/stats", .auth = .session, .policy = .read, .handler = stats.totals },
-    .{ .method = .GET, .pattern = "/api/stats/timeseries", .auth = .session, .policy = .read, .handler = stats.timeseries },
-    .{ .method = .GET, .pattern = "/api/stats/types", .auth = .session, .policy = .read, .handler = stats.types },
-    .{ .method = .GET, .pattern = "/api/stats/routes", .auth = .session, .policy = .read, .handler = stats.routes },
-    .{ .method = .GET, .pattern = "/api/stats/clients", .auth = .session, .policy = .read, .handler = stats.clients },
+    .{ .method = .GET, .pattern = "/api/overview", .auth = .session, .policy = .read, .handler = overview.handle },
     .{ .method = .GET, .pattern = "/api/lookup", .auth = .session, .policy = .read, .handler = lookup.handle },
 
     // Diagnostics: the operational event log (milestone 27). The two purges are
@@ -161,7 +157,7 @@ const std = @import("std");
 const testing = std.testing;
 
 test "the table carries every endpoint of the milestone" {
-    try testing.expectEqual(@as(usize, 64), table.len);
+    try testing.expectEqual(@as(usize, 60), table.len);
 }
 
 test "no two entries claim the same method and pattern" {