add more things???

db.ts

@@ -0,0 +1,49 @@
+import Database = require("better-sqlite3")
+
+import * as C from "./config"
+import * as log from "./log"
+
+export const DB = Database(C.get("db"))
+
+const migrations = [
+`
+--whatever
+`
+]
+
+const executeMigration = DB.transaction((i) => {
+    const migration = migrations[i]
+    DB.exec(migration)
+    DB.pragma(`user_version = ${i + 1}`)
+    log.info(`Migrated to schema ${i + 1}`)
+})
+
+const schemaVersion = DB.pragma("user_version", { simple: true })
+if (schemaVersion < migrations.length) {
+    log.info(`Migrating DB - schema ${schemaVersion} used, schema ${migrations.length} available`)
+    for (let i = schemaVersion; i < migrations.length; i++) {
+        executeMigration(i)
+    }
+}
+
+DB.pragma("foreign_keys = 1")
+
+const preparedStatements = new Map()
+
+export const SQL = (strings, ...params) => {
+    const sql = strings.join("?")
+    let stmt
+    const cachedValue = preparedStatements.get(sql)
+    if (!cachedValue) {
+        stmt = DB.prepare(sql)
+        preparedStatements.set(sql, stmt)
+    } else {
+        stmt = cachedValue
+    }
+    return {
+        get: () => stmt.get.apply(stmt, params),
+        run: () => stmt.run.apply(stmt, params),
+        all: () => stmt.all.apply(stmt, params),
+        statement: stmt
+    }
+}