added database provider & refactor sql execute

src/stores/context.tsx

@@ -1,11 +0,0 @@
-/* eslint-disable @typescript-eslint/no-explicit-any */
-import { RelayPool } from 'nostr-relaypool';
-import { createContext, useMemo } from 'react';
-
-export const RelayContext = createContext({});
-
-export default function RelayProvider({ relays, children }: { relays: any; children: React.ReactNode }) {
-  const value = useMemo(() => new RelayPool(relays, { useEventCache: false }), [relays]);
-
-  return <RelayContext.Provider value={value}>{children}</RelayContext.Provider>;
-}