drop DB functionality added

repo/setup_db.ts

@@ -10,6 +10,26 @@ import pg from "npm:pg";
 import { Database } from "./scheme.ts"
 import { CompiledConfig } from "../cfg/config.ts";
 
+
+export const dropDb = async (migrator: Migrator, downLimit?: number) => {
+  console.log(`droping the DB`)
+  let downCounter: number = 0 // to prevent infinite loop
+  while (true) {
+    if (downLimit && downCounter === downLimit) return
+    const { results } = await migrator.migrateDown()
+    if (!results) continue
+
+    for (const { status, migrationName } of results) {
+      if (status === "Error" || status === "NotExecuted") {
+        return
+      }
+      console.log(`down migration "${migrationName}" was executed successfully`)
+    }
+    downCounter++
+  }
+}
+
+
 export type SetupDbOutput = {
     pool: pg.Pool,
     db: Kysely<Database>,
@@ -42,6 +62,9 @@ export const setupDB = async (cfg: CompiledConfig): Promise<SetupDbOutput> => {
       allowUnorderedMigrations: true
     })
 
+    if (cfg.migrationCfg.dropDb) {
+      await dropDb(migrator, 100)
+    }
     const { error, results } = await migrator.migrateToLatest()
 
     results?.forEach((it) => {