admin control features and admin dashboard

internal/db/migrations/0002_dynamic_config.sql

@@ -0,0 +1,26 @@
+-- Dynamic configuration tables: sites, target_groups, check_types.
+-- validators already exists (0001_init.sql) and needs no new columns.
+-- Bootstrap semantics (apply YAML only when the table is empty) live in
+-- internal/db/bootstrap.go, not in this migration.
+
+CREATE TABLE sites (
+  idx         INTEGER PRIMARY KEY,        -- 1, 2 or 3 -- fixed slot
+  site_id     TEXT NOT NULL UNIQUE,
+  created_at  TIMESTAMP NOT NULL,
+  updated_at  TIMESTAMP NOT NULL
+);
+
+CREATE TABLE target_groups (
+  group_name  TEXT PRIMARY KEY,
+  targets     TEXT NOT NULL,               -- JSON array of strings
+  created_at  TIMESTAMP NOT NULL,
+  updated_at  TIMESTAMP NOT NULL
+);
+
+CREATE TABLE check_types (
+  name          TEXT PRIMARY KEY,
+  enabled       BOOLEAN NOT NULL DEFAULT 1,
+  target_groups TEXT NOT NULL,             -- JSON array of group names
+  created_at    TIMESTAMP NOT NULL,
+  updated_at    TIMESTAMP NOT NULL
+);