first commit

packages/db/src/session-store.ts

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+/**
+ * A persistent, process-shared session backend built on `bun:sqlite` (sync, so
+ * it satisfies `SessionBackend` without a load/save wrapper). Sessions survive
+ * restarts and are shared by every worker pointed at the same file.
+ *
+ *   import { setSessionBackend } from "@wrnexus/core";
+ *   import { sqliteSessionStore } from "@wrnexus/db/session";
+ *   setSessionBackend(sqliteSessionStore("./sessions.db"));
+ */
+
+import { Database } from "bun:sqlite";
+import type { SessionBackend, SessionEntry } from "@wrnexus/core";
+
+export function sqliteSessionStore(path = "sessions.db"): SessionBackend {
+  const db = new Database(path);
+  db.run("PRAGMA journal_mode = WAL");
+  db.run(
+    "CREATE TABLE IF NOT EXISTS sessions (id TEXT PRIMARY KEY, data TEXT NOT NULL, expiresAt INTEGER NOT NULL)",
+  );
+  const getStmt = db.query("SELECT data, expiresAt FROM sessions WHERE id = ?");
+  const setStmt = db.query(
+    "INSERT INTO sessions (id, data, expiresAt) VALUES (?, ?, ?) " +
+      "ON CONFLICT(id) DO UPDATE SET data = excluded.data, expiresAt = excluded.expiresAt",
+  );
+  const delStmt = db.query("DELETE FROM sessions WHERE id = ?");
+  const gcStmt = db.query("DELETE FROM sessions WHERE expiresAt <= ?");
+
+  return {
+    get(id): SessionEntry | undefined {
+      const row = getStmt.get(id) as { data: string; expiresAt: number } | null;
+      if (!row) return undefined;
+      try {
+        return { data: JSON.parse(row.data) as Record<string, unknown>, expiresAt: row.expiresAt };
+      } catch {
+        return undefined;
+      }
+    },
+    set(id, entry) {
+      setStmt.run(id, JSON.stringify(entry.data), entry.expiresAt);
+    },
+    delete(id) {
+      delStmt.run(id);
+    },
+    gc(now) {
+      gcStmt.run(now);
+    },
+  };
+}