diff --git a/src/app/auth/signin/page.tsx b/src/app/auth/signin/page.tsx
index 8ad10f6..43f44a0 100644
--- a/src/app/auth/signin/page.tsx
+++ b/src/app/auth/signin/page.tsx
@@ -32,7 +32,7 @@ export default function SignInPage() {
 				providerId: "authentik",
 				callbackURL: "/",
 			});
-		} catch (_error) {
+		} catch {
 			toast.error("Failed to sign in. Please try again.");
 		} finally {
 			setIsLoading(false);
diff --git a/src/app/page.tsx b/src/app/page.tsx
index 9ba797a..510720d 100644
--- a/src/app/page.tsx
+++ b/src/app/page.tsx
@@ -182,10 +182,9 @@ export default function HomePage() {
 
 	const persistAiEvents = async (data: CalendarEvent[]) => {
 		for (const ev of data) {
-			const { id: _existingId, ...rest } = ev;
-			const newEvent = {
+			const newEvent: CalendarEvent = {
+				...ev,
 				id: nanoid(),
-				...rest,
 				createdAt: new Date().toISOString(),
 				lastModified: new Date().toISOString(),
 			};
diff --git a/src/components/ics-file-picker.tsx b/src/components/ics-file-picker.tsx
index e1a6b32..675d844 100644
--- a/src/components/ics-file-picker.tsx
+++ b/src/components/ics-file-picker.tsx
@@ -47,7 +47,6 @@ export function IcsFilePicker({
 				accept=".ics"
 				onChange={handleFileChange}
 				className="hidden"
-				aria-hidden="true"
 			/>
 			<Button
 				onClick={handleButtonClick}
diff --git a/src/components/rrule-display.tsx b/src/components/rrule-display.tsx
index 621f73e..bcaa6e8 100644
--- a/src/components/rrule-display.tsx
+++ b/src/components/rrule-display.tsx
@@ -41,8 +41,8 @@ export function RRuleDisplayDetailed({
 
 				{showBadges && details.length > 0 && (
 					<div className="flex flex-wrap gap-1">
-						{details.map((detail, index) => (
-							<Badge key={index} variant="outline" className="text-xs">
+						{details.map((detail) => (
+							<Badge key={detail} variant="outline" className="text-xs">
 								{detail}
 							</Badge>
 						))}
@@ -159,7 +159,7 @@ function formatRRuleToHuman(rule: RecurrenceRule): string {
 				const [, num, dayCode] = match;
 				const dayName = dayNames[dayCode as keyof typeof dayNames];
 				if (num) {
-					const ordinal = getOrdinal(parseInt(num));
+					const ordinal = getOrdinal(parseInt(num, 10));
 					return `${ordinal} ${dayName}`;
 				}
 				return dayName;
diff --git a/src/components/sign-in.tsx b/src/components/sign-in.tsx
index fc71635..314382c 100644
--- a/src/components/sign-in.tsx
+++ b/src/components/sign-in.tsx
@@ -13,7 +13,7 @@ export default function SignIn() {
 		try {
 			await signOut();
 			router.push("/");
-		} catch (_error) {
+		} catch {
 			toast.error("Failed to sign out. Please try again.");
 		}
 	};
diff --git a/src/db/index.ts b/src/db/index.ts
index 9c61130..7271882 100644
--- a/src/db/index.ts
+++ b/src/db/index.ts
@@ -2,7 +2,11 @@ import { drizzle } from "drizzle-orm/postgres-js";
 import postgres from "postgres";
 import * as schema from "./schema";
 
-const connectionString = process.env.DATABASE_URL!;
+const connectionString = process.env.DATABASE_URL;
+
+if (!connectionString) {
+	throw new Error("DATABASE_URL environment variable is required");
+}
 
 const client = postgres(connectionString, {
 	prepare: false,