Improve db connection pool management

src/hooks.server.ts

-import { dbConnect } from "$lib/server/db-connect"
+import { getDbPool } from "$lib/server/db-connect"
 import type { Handle } from "@sveltejs/kit"
 
 export const handle: Handle = async ({ event, resolve }) => {
 	if (!event.locals.sql) {
-		const sql = await dbConnect()
-		event.locals = { sql }
+		event.locals.sql = await getDbPool()
 	}
 	return await resolve(event)
 }

src/lib/server/db-connect.ts

+import config from "$lib/server/config"
 import postgres from "postgres"
 
-import config from "$lib/server/config"
+let sql: ReturnType<typeof postgres> | null = null
 
-export async function dbConnect() {
-	try {
-		const sql = postgres({
+export async function getDbPool() {
+	if (!sql) {
+		sql = postgres({
 			host: config.db.host,
 			database: config.db.database,
 			port: config.db.port,
 			username: config.db.username,
 			password: config.db.password,
 			max: 20,
+			idle_timeout: 30,
+			connection: {
+				application_name: "legi-ui",
+			},
 		})
+	}
 	return sql
-	} catch (error: unknown) {
-		if (typeof error === "string") {
-			console.log(
-				"An error occured while calling oracledb.createPool:\n",
-				error,
-			)
-		} else if (error instanceof Error) {
-			console.log(
-				"An error occured while calling oracledb.createPool:\n",
-				error.stack,
-			)
 }
-		throw error
+
+export async function closeDbPool() {
+	if (sql) {
+		await sql.end()
+		sql = null
 	}
 }

src/routes/api/toc/[id]/+server.ts

@@ -10,10 +10,10 @@ export const GET: RequestHandler = async ({ params, locals }) => {
 	const { id } = params as { id: string }
 	const { sql } = locals
 
-	const dbConnection = await sql.reserve()
-
 	switch (true) {
 		case id.startsWith("LEGITEXT"): {
+			const dbConnection = await sql.reserve()
+
 			const structDataFromDb: queryDataStructData[] = await dbConnection<JSON>`
 			select jsonb_path_query(data, '$.STRUCT') AS struct_data
 			from textelr
@@ -35,6 +35,8 @@ export const GET: RequestHandler = async ({ params, locals }) => {
 			}
 		}
 		case id.startsWith("LEGISCTA"): {
+			const dbConnection = await sql.reserve()
+
 			const structDataFromDb: queryDataStructData[] = await dbConnection<JSON>`
 			select jsonb_path_query(data, '$.STRUCTURE_TA') AS struct_data
 			from section_ta