Add Loki and Sentinel utility classes for web API endpoints

- Implemented LokiUtils class with GET and POST endpoints for managing scripts, jobs, and payloads.
- Added SentinelUtils class with GET and POST endpoints for managing events, rules, devices, and notifications.
- Both classes include error handling and JSON response formatting.

db_utils/loki.py

@@ -0,0 +1,51 @@
+"""
+Loki DB operations — HID scripts and job tracking.
+"""
+import logging
+
+from logger import Logger
+
+logger = Logger(name="db_utils.loki", level=logging.DEBUG)
+
+
+class LokiOps:
+    def __init__(self, base):
+        self.base = base
+
+    def create_tables(self):
+        """Create all Loki tables."""
+
+        # User-saved HID scripts
+        self.base.execute("""
+            CREATE TABLE IF NOT EXISTS loki_scripts (
+                id            INTEGER PRIMARY KEY AUTOINCREMENT,
+                name          TEXT NOT NULL UNIQUE,
+                description   TEXT DEFAULT '',
+                content       TEXT NOT NULL DEFAULT '',
+                category      TEXT DEFAULT 'general',
+                target_os     TEXT DEFAULT 'any',
+                created_at    TEXT DEFAULT CURRENT_TIMESTAMP,
+                updated_at    TEXT DEFAULT CURRENT_TIMESTAMP
+            )
+        """)
+
+        # Job execution history
+        self.base.execute("""
+            CREATE TABLE IF NOT EXISTS loki_jobs (
+                id            TEXT PRIMARY KEY,
+                script_id     INTEGER,
+                script_name   TEXT DEFAULT '',
+                status        TEXT DEFAULT 'pending',
+                output        TEXT DEFAULT '',
+                error         TEXT DEFAULT '',
+                started_at    TEXT,
+                finished_at   TEXT,
+                created_at    TEXT DEFAULT CURRENT_TIMESTAMP
+            )
+        """)
+        self.base.execute(
+            "CREATE INDEX IF NOT EXISTS idx_loki_jobs_status "
+            "ON loki_jobs(status)"
+        )
+
+        logger.debug("Loki tables created/verified")