feat: Replace Meetings with Calendar - events with types and assigned users

- Rename meetings table to events with type field (meeting/event)
- Add eventUsers junction table for user assignments
- Members see only events they're assigned to
- Calendar endpoint returns events + todos for month
- Add migration SQL for database changes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/db/migrations/0001_meetings_to_events.sql

@@ -0,0 +1,21 @@
+-- Migration: Convert meetings to events with type and assigned users
+-- Run this migration manually or via drizzle-kit
+
+-- Step 1: Rename meetings table to events
+ALTER TABLE meetings RENAME TO events;
+
+-- Step 2: Add type column
+ALTER TABLE events ADD COLUMN type TEXT NOT NULL DEFAULT 'meeting';
+
+-- Step 3: Create event_users junction table
+CREATE TABLE event_users (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  event_id UUID NOT NULL REFERENCES events(id) ON DELETE CASCADE,
+  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  assigned_at TIMESTAMP DEFAULT NOW() NOT NULL,
+  UNIQUE(event_id, user_id)
+);
+
+-- Step 4: Assign existing events to their creators
+INSERT INTO event_users (event_id, user_id)
+SELECT id, created_by FROM events WHERE created_by IS NOT NULL;

src/db/schema.js

@@ -242,11 +242,12 @@ export const timesheets = pgTable('timesheets', {
   updatedAt: timestamp('updated_at').defaultNow().notNull(),
 });
 
-// Meetings table - meetingy/stretnutia (iba admin môže CRUD)
-export const meetings = pgTable('meetings', {
+// Events table - udalosti v kalendári (meeting/event)
+export const events = pgTable('events', {
   id: uuid('id').primaryKey().defaultRandom(),
   title: text('title').notNull(),
   description: text('description'),
+  type: text('type').notNull().default('meeting'), // 'meeting' | 'event'
   start: timestamp('start', { withTimezone: true }).notNull(),
   end: timestamp('end', { withTimezone: true }).notNull(),
   createdBy: uuid('created_by').references(() => users.id, { onDelete: 'set null' }),
@@ -254,6 +255,16 @@ export const meetings = pgTable('meetings', {
   updatedAt: timestamp('updated_at', { withTimezone: true }).defaultNow().notNull(),
 });
 
+// Event Users - many-to-many medzi events a users (kto vidí udalosť)
+export const eventUsers = pgTable('event_users', {
+  id: uuid('id').primaryKey().defaultRandom(),
+  eventId: uuid('event_id').references(() => events.id, { onDelete: 'cascade' }).notNull(),
+  userId: uuid('user_id').references(() => users.id, { onDelete: 'cascade' }).notNull(),
+  assignedAt: timestamp('assigned_at').defaultNow().notNull(),
+}, (table) => ({
+  eventUserUnique: unique('event_user_unique').on(table.eventId, table.userId),
+}));
+
 // Time Entries table - sledovanie odpracovaného času používateľov
 export const timeEntries = pgTable('time_entries', {
   id: uuid('id').primaryKey().defaultRandom(),