add delete method

com/Unit/Delete.lua

@@ -0,0 +1,78 @@
+-- File com/Unit/Delete.lua
+--
+-- Created at 2025-05-10 19:18
+--
+-- Updated at - 
+
+local log = require("internal.log")
+local db = require("internal.database.sqlite").connect("db/unit.db", {log = true})
+local session = require("internal.session")
+local crypt = require("internal.crypt.bcrypt")
+local sha256 = require("internal.crypt.sha256")
+
+local common = require("com/Unit/_common")
+
+-- Preparing for first db query
+local function close_db()
+  if db then
+    log.debug("Closing DB connection")
+    db:close()
+    db = nil
+  end
+end
+
+local params = session.request.params.get()
+
+local ok, mp = common.CheckMissingElement({"user_id"}, params)
+if not ok then
+  close_db()
+  session.response.send_error(-32602, "Missing params", mp)
+end
+
+local existing, err = db:query([[
+  SELECT 1
+  FROM units
+  WHERE user_id = ?
+    AND entry_status != 'deleted'
+    AND deleted_at IS NULL
+  LIMIT 1
+]], {
+  params.user_id
+})
+
+if err ~= nil then
+  log.error("Email check failed: "..tostring(err))
+  close_db()
+  session.response.send_error()
+end
+
+if existing and #existing == 0 then
+  close_db()
+  session.response.send_error(-32102, "Unit is not exists")
+end
+
+local ctx, err = db:exec(
+  [[
+    UPDATE units
+    SET entry_status = 'deleted',
+        deleted_at = CURRENT_TIMESTAMP
+    WHERE user_id = ? AND deleted_at is NULL
+  ]],
+  { params.user_id }
+)
+
+if err ~= nil then
+  log.error("Soft delete failed: " .. tostring(err))
+  close_db()
+  session.response.send_error("Failed to delete unit")
+end
+
+local res, err = ctx:wait()
+if err ~= nil then
+  log.error("Soft delete confirmation failed: " .. tostring(err))
+  close_db()
+  session.response.send_error("Failed to delete unit")
+end
+
+close_db()
+session.response.send({message = "Unit deleted successfully", unit_id = params.user_id})