初版功能完成

internal/database/migrations/0001_initial.sql

@@ -0,0 +1,67 @@
+CREATE TABLE settings (
+    key TEXT PRIMARY KEY,
+    value TEXT NOT NULL,
+    updated_at TEXT NOT NULL
+);
+
+CREATE TABLE nodes (
+    node_id TEXT PRIMARY KEY,
+    type TEXT NOT NULL CHECK (type IN ('engineer', 'site')),
+    name TEXT NOT NULL,
+    overlay_ip TEXT NOT NULL UNIQUE,
+    wg_public_key TEXT NOT NULL UNIQUE,
+    node_token_hash BLOB NOT NULL,
+    status TEXT NOT NULL DEFAULT 'OFFLINE',
+    version TEXT NOT NULL DEFAULT '',
+    os_version TEXT NOT NULL DEFAULT '',
+    last_seen TEXT,
+    created_at TEXT NOT NULL,
+    updated_at TEXT NOT NULL
+);
+
+CREATE INDEX idx_nodes_type_status ON nodes(type, status);
+
+CREATE TABLE sessions (
+    session_id TEXT PRIMARY KEY,
+    engineer_node_id TEXT NOT NULL REFERENCES nodes(node_id) ON DELETE CASCADE,
+    site_node_id TEXT NOT NULL REFERENCES nodes(node_id) ON DELETE CASCADE,
+    status TEXT NOT NULL,
+    created_at TEXT NOT NULL,
+    active_at TEXT,
+    closed_at TEXT,
+    error_code TEXT
+);
+
+CREATE INDEX idx_sessions_engineer_status ON sessions(engineer_node_id, status);
+CREATE INDEX idx_sessions_site_status ON sessions(site_node_id, status);
+
+CREATE TABLE session_cidrs (
+    session_id TEXT NOT NULL REFERENCES sessions(session_id) ON DELETE CASCADE,
+    cidr TEXT NOT NULL,
+    PRIMARY KEY (session_id, cidr)
+);
+
+CREATE TABLE session_stats (
+    session_id TEXT PRIMARY KEY REFERENCES sessions(session_id) ON DELETE CASCADE,
+    tx_bytes INTEGER NOT NULL DEFAULT 0 CHECK (tx_bytes >= 0),
+    rx_bytes INTEGER NOT NULL DEFAULT 0 CHECK (rx_bytes >= 0),
+    tx_packets INTEGER NOT NULL DEFAULT 0 CHECK (tx_packets >= 0),
+    rx_packets INTEGER NOT NULL DEFAULT 0 CHECK (rx_packets >= 0),
+    updated_at TEXT NOT NULL
+);
+
+CREATE TABLE event_logs (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    time TEXT NOT NULL,
+    level TEXT NOT NULL,
+    module TEXT NOT NULL,
+    node_id TEXT,
+    session_id TEXT,
+    message TEXT NOT NULL,
+    fields_json TEXT NOT NULL DEFAULT '{}'
+);
+
+CREATE INDEX idx_event_logs_time ON event_logs(time DESC);
+CREATE INDEX idx_event_logs_node ON event_logs(node_id, time DESC);
+CREATE INDEX idx_event_logs_session ON event_logs(session_id, time DESC);
+