feat: watcher agent management system implemented.

migrate_watcher_agents.py

@@ -0,0 +1,37 @@
+"""
+Migration: add watcher_agents table.
+
+Safe to run multiple times (idempotent).
+"""
+
+import sqlite3
+import os
+
+DB_PATH = os.path.join(os.path.dirname(__file__), "data", "seismo.db")
+
+
+def migrate():
+    con = sqlite3.connect(DB_PATH)
+    cur = con.cursor()
+
+    cur.execute("""
+        CREATE TABLE IF NOT EXISTS watcher_agents (
+            id              TEXT PRIMARY KEY,
+            source_type     TEXT NOT NULL,
+            version         TEXT,
+            last_seen       DATETIME,
+            status          TEXT NOT NULL DEFAULT 'unknown',
+            ip_address      TEXT,
+            log_tail        TEXT,
+            update_pending  INTEGER NOT NULL DEFAULT 0,
+            update_version  TEXT
+        )
+    """)
+
+    con.commit()
+    con.close()
+    print("Migration complete: watcher_agents table ready.")
+
+
+if __name__ == "__main__":
+    migrate()