fix: add better-sqlite3 to getTableAndColumnsName

[immz4]

Add better-sqlite3 to the DataSource type check

Example code:

import { SqlDatabase } from "langchain/sql_db";
import { DataSource } from "typeorm";

const datasource = new DataSource({
  type: "better-sqlite3",
  database: "test.db",
  readonly: true,
});

const db = await SqlDatabase.fromDataSourceParams({
  appDataSource: datasource,
});

console.log(await db.getTableInfo())

Execution before fix:

❯ pnpm exec tsx index-mini.ts
file:///home/lemon/Documents/text-to-sql-mcp/node_modules/.pnpm/langchain@0.3.30_@langchain+core@0.3.70_@opentelemetry+api@1.9.0_openai@5.12.2_zod@4.0.17___@_oks7tym3ksu5msad6f4d7govii/node_modules/langchain/dist/util/sql_utils.js:140
    throw new Error("Database type not implemented yet");
          ^

Error: Database type not implemented yet
    at getTableAndColumnsName (file:///home/lemon/Documents/text-to-sql-mcp/node_modules/.pnpm/langchain@0.3.30_@langchain+core@0.3.70_@opentelemetry+api@1.9.0_openai@5.12.2_zod@4.0.17___@_oks7tym3ksu5msad6f4d7govii/node_modules/langchain/dist/util/sql_utils.js:140:11)
    at SqlDatabase.fromDataSourceParams (/home/lemon/Documents/text-to-sql-mcp/node_modules/.pnpm/langchain@0.3.30_@langchain+core@0.3.70_@opentelemetry+api@1.9.0_openai@5.12.2_zod@4.0.17___@_oks7tym3ksu5msad6f4d7govii/node_modules/langchain/dist/sql_db.js:86:39)
    at async <anonymous> (/home/lemon/Documents/text-to-sql-mcp/index-mini.ts:10:12)

Node.js v24.5.0

Execution after fix:

❯ pnpm exec tsx index-mini.ts
CREATE TABLE contacts (
id INTEGER , first_name TEXT NOT NULL, last_name TEXT NOT NULL, city TEXT , created_at DATETIME ) 
SELECT * FROM "contacts" LIMIT 3;
 id first_name last_name city created_at
 1 John Smith New York 2024-01-15 09:30:00
 2 Sarah Johnson Los Angeles 2024-01-20 14:22:15
 3 Michael Brown Chicago 2024-02-03 11:45:30
CREATE TABLE cases (
id INTEGER , topic TEXT NOT NULL, created_at DATETIME ) 
SELECT * FROM "cases" LIMIT 3;
 id topic created_at
 1 Website Development 2024-01-18 10:15:30
 2 Mobile App Bug Fix 2024-01-25 14:30:45
 3 Database Migration 2024-02-08 09:45:20

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[hntrl]

Thanks for the PR @immz4!

Just as a heads up, we're reassessing sql utils for the langchain package as apart of v1. We'll wave this through since its pretty minimal, but these primitives you're touching are subject to heavy changes.