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backend/db/migrations/028_create_dynamic_tables.sql

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+-- Миграция для динамических пользовательских таблиц (аналог Notion)
+
+CREATE TABLE IF NOT EXISTS user_tables (
+  id SERIAL PRIMARY KEY,
+  name VARCHAR(255) NOT NULL,
+  description TEXT,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS user_columns (
+  id SERIAL PRIMARY KEY,
+  table_id INTEGER NOT NULL REFERENCES user_tables(id) ON DELETE CASCADE,
+  name VARCHAR(255) NOT NULL,
+  type VARCHAR(50) NOT NULL, -- text, number, select, multiselect, date, etc.
+  options JSONB DEFAULT NULL, -- для select/multiselect
+  "order" INTEGER DEFAULT 0,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS user_rows (
+  id SERIAL PRIMARY KEY,
+  table_id INTEGER NOT NULL REFERENCES user_tables(id) ON DELETE CASCADE,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS user_cell_values (
+  id SERIAL PRIMARY KEY,
+  row_id INTEGER NOT NULL REFERENCES user_rows(id) ON DELETE CASCADE,
+  column_id INTEGER NOT NULL REFERENCES user_columns(id) ON DELETE CASCADE,
+  value TEXT,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  UNIQUE(row_id, column_id)
+);