diff --git a/bot_bottle/config_store.py b/bot_bottle/config_store.py
index 93fda93..400f1da 100644
--- a/bot_bottle/config_store.py
+++ b/bot_bottle/config_store.py
@@ -14,66 +14,58 @@ except ImportError:
     from supervise_types import host_db_path  # type: ignore[import-not-found]  # pylint: disable=import-error,no-name-in-module
 
 
-CACHED_IMAGE_STALE_WARNING_DAYS = "cached_image_stale_warning_days"
 DEFAULT_CACHED_IMAGE_STALE_WARNING_DAYS = 1
 
 
 class ConfigStore(DbStore):
-    """SQLite key/value configuration for host-side bot-bottle settings."""
+    """SQLite configuration for host-side bot-bottle settings."""
 
     def __init__(self, db_path: Path | None = None) -> None:
         migrations = TableMigrations("config_store", [
-            # v1 — generic string key/value settings
+            # v1 — host-side bot-bottle settings
             """
             CREATE TABLE IF NOT EXISTS bot_bottle_config (
-                key TEXT PRIMARY KEY,
-                value TEXT NOT NULL
+                id INTEGER PRIMARY KEY CHECK (id = 1),
+                cached_image_stale_warning_days INTEGER NOT NULL DEFAULT 1
             )
             """,
         ])
         super().__init__(db_path or host_db_path(), migrations)
 
-    def get(self, key: str) -> str | None:
+    def cached_image_stale_warning_days(self) -> int:
         if not self.db_path.is_file():
-            return None
+            return DEFAULT_CACHED_IMAGE_STALE_WARNING_DAYS
         with self._connect() as conn:
             row = conn.execute(
-                "SELECT value FROM bot_bottle_config WHERE key = ?",
-                (key,),
+                """
+                SELECT cached_image_stale_warning_days
+                FROM bot_bottle_config
+                WHERE id = 1
+                """,
             ).fetchone()
-        return str(row["value"]) if row is not None else None
+        if row is None:
+            return DEFAULT_CACHED_IMAGE_STALE_WARNING_DAYS
+        try:
+            return int(row["cached_image_stale_warning_days"])
+        except (TypeError, ValueError):
+            return DEFAULT_CACHED_IMAGE_STALE_WARNING_DAYS
 
-    def set(self, key: str, value: str) -> Path:
+    def set_cached_image_stale_warning_days(self, days: int) -> Path:
         with self._connect() as conn:
             conn.execute(
                 """
-                INSERT INTO bot_bottle_config (key, value)
-                VALUES (?, ?)
-                ON CONFLICT(key) DO UPDATE SET value = excluded.value
+                INSERT INTO bot_bottle_config (id, cached_image_stale_warning_days)
+                VALUES (1, ?)
+                ON CONFLICT(id) DO UPDATE SET
+                    cached_image_stale_warning_days = excluded.cached_image_stale_warning_days
                 """,
-                (key, value),
+                (days,),
             )
         self._chmod()
         return self.db_path
 
-    def get_int(self, key: str, default: int) -> int:
-        raw = self.get(key)
-        if raw is None:
-            return default
-        try:
-            return int(raw)
-        except ValueError:
-            return default
-
-    def cached_image_stale_warning_days(self) -> int:
-        return self.get_int(
-            CACHED_IMAGE_STALE_WARNING_DAYS,
-            DEFAULT_CACHED_IMAGE_STALE_WARNING_DAYS,
-        )
-
 
 __all__ = [
-    "CACHED_IMAGE_STALE_WARNING_DAYS",
     "DEFAULT_CACHED_IMAGE_STALE_WARNING_DAYS",
     "ConfigStore",
 ]
diff --git a/tests/unit/test_config_store.py b/tests/unit/test_config_store.py
index 19676c8..df8b717 100644
--- a/tests/unit/test_config_store.py
+++ b/tests/unit/test_config_store.py
@@ -2,12 +2,12 @@
 
 from __future__ import annotations
 
+import sqlite3
 import tempfile
 import unittest
 from pathlib import Path
 
 from bot_bottle.config_store import (
-    CACHED_IMAGE_STALE_WARNING_DAYS,
     DEFAULT_CACHED_IMAGE_STALE_WARNING_DAYS,
     ConfigStore,
 )
@@ -28,9 +28,24 @@ class TestConfigStore(unittest.TestCase):
         with tempfile.TemporaryDirectory(prefix="config-store.") as tmp:
             store = ConfigStore(Path(tmp) / "bot-bottle.db")
             store.migrate()
-            store.set(CACHED_IMAGE_STALE_WARNING_DAYS, "7")
+            store.set_cached_image_stale_warning_days(7)
             self.assertEqual(7, store.cached_image_stale_warning_days())
 
+    def test_config_schema_uses_explicit_settings_columns(self) -> None:
+        with tempfile.TemporaryDirectory(prefix="config-store.") as tmp:
+            store = ConfigStore(Path(tmp) / "bot-bottle.db")
+            store.migrate()
+            with sqlite3.connect(store.db_path) as conn:
+                conn.row_factory = sqlite3.Row
+                columns = [
+                    row["name"]
+                    for row in conn.execute("PRAGMA table_info(bot_bottle_config)")
+                ]
+            self.assertEqual([
+                "id",
+                "cached_image_stale_warning_days",
+            ], columns)
+
     def test_store_manager_includes_config_store(self) -> None:
         with tempfile.TemporaryDirectory(prefix="config-store.") as tmp:
             db = Path(tmp) / "bot-bottle.db"