Add Plutonium version checks and scheduled rolling restarts

src/lib/server/db/schema.sql

@@ -362,6 +362,24 @@ CREATE TABLE IF NOT EXISTS settings (
     key   TEXT PRIMARY KEY,
     value TEXT NOT NULL
 );
+CREATE TABLE IF NOT EXISTS plutonium_versions (
+    server TEXT PRIMARY KEY REFERENCES servers(name) ON DELETE CASCADE,
+    revision INTEGER,
+    checked_at TEXT NOT NULL,
+    error TEXT
+);
+CREATE TABLE IF NOT EXISTS maintenance_jobs (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    server TEXT NOT NULL,
+    state TEXT NOT NULL DEFAULT 'queued',
+    target_revision INTEGER,
+    requested_at TEXT NOT NULL,
+    restarted_at TEXT,
+    finished_at TEXT,
+    detail TEXT
+);
+CREATE UNIQUE INDEX IF NOT EXISTS idx_maintenance_pending ON maintenance_jobs(server)
+    WHERE state IN ('queued', 'restarting');
 CREATE TABLE IF NOT EXISTS server_telemetry (
     server TEXT PRIMARY KEY REFERENCES servers(name) ON DELETE CASCADE,
     round INTEGER NOT NULL,