Prototype with single host server and no admin panel (#2)

Reviewed-on: wrenn/sandbox#2
Co-authored-by: pptx704 <rafeed@omukk.dev>
Co-committed-by: pptx704 <rafeed@omukk.dev>

db/migrations/20260310094104_initial.sql

@@ -0,0 +1,25 @@
+-- +goose Up
+
+CREATE TABLE sandboxes (
+    id              TEXT PRIMARY KEY,
+    owner_id        TEXT NOT NULL DEFAULT '',
+    host_id         TEXT NOT NULL DEFAULT 'default',
+    template        TEXT NOT NULL DEFAULT 'minimal',
+    status          TEXT NOT NULL DEFAULT 'pending',
+    vcpus           INTEGER NOT NULL DEFAULT 1,
+    memory_mb       INTEGER NOT NULL DEFAULT 512,
+    timeout_sec     INTEGER NOT NULL DEFAULT 0,
+    guest_ip        TEXT NOT NULL DEFAULT '',
+    host_ip         TEXT NOT NULL DEFAULT '',
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    started_at      TIMESTAMPTZ,
+    last_active_at  TIMESTAMPTZ,
+    last_updated    TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX idx_sandboxes_status ON sandboxes(status);
+CREATE INDEX idx_sandboxes_host_status ON sandboxes(host_id, status);
+
+-- +goose Down
+
+DROP TABLE sandboxes;