Initial commit MKD fixes

backend/migrations/create_pr_attraction_actions.sql

@@ -0,0 +1,19 @@
+-- PR Привлечение: действия, которыми привлекали людей (рассылка, мероприятие, пост и т.д.)
+CREATE TABLE IF NOT EXISTS pr_attraction_actions (
+  id                        BIGSERIAL PRIMARY KEY,
+  title                     TEXT NOT NULL,
+  description               TEXT,
+  channel_id                BIGINT REFERENCES pr_smm_channels(id) ON DELETE SET NULL,
+  action_type               VARCHAR(20) NOT NULL CHECK (action_type IN ('mailing', 'event', 'post', 'other')),
+  action_date               DATE NOT NULL DEFAULT CURRENT_DATE,
+  new_subscribers_attributed INT,
+  event_id                   BIGINT REFERENCES pr_events(id) ON DELETE SET NULL,
+  created_at                TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  created_by                 TEXT
+);
+
+CREATE INDEX IF NOT EXISTS idx_pr_attraction_actions_channel ON pr_attraction_actions(channel_id);
+CREATE INDEX IF NOT EXISTS idx_pr_attraction_actions_type ON pr_attraction_actions(action_type);
+CREATE INDEX IF NOT EXISTS idx_pr_attraction_actions_date ON pr_attraction_actions(action_date DESC);
+
+COMMENT ON TABLE pr_attraction_actions IS 'Действия привлечения: рассылка, мероприятие, пост и т.д., с приростом подписчиков';