Subject CRUD

public/userarea/scadenzario/sql/migrate_subjects.sql

@@ -0,0 +1,25 @@
+-- One-time migration: move scad_deadlines.category into dedicated scad_subjects table
+
+CREATE TABLE IF NOT EXISTS scad_subjects (
+    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    name VARCHAR(100) NOT NULL,
+    color VARCHAR(7) NOT NULL DEFAULT '#6c757d',
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    UNIQUE KEY uniq_name (name)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+INSERT IGNORE INTO scad_subjects (name)
+SELECT DISTINCT TRIM(category) FROM scad_deadlines
+WHERE category IS NOT NULL AND TRIM(category) <> '';
+
+ALTER TABLE scad_deadlines
+    ADD COLUMN subject_id INT UNSIGNED NULL AFTER id,
+    ADD INDEX idx_subject (subject_id),
+    ADD CONSTRAINT fk_deadlines_subject FOREIGN KEY (subject_id) REFERENCES scad_subjects(id) ON DELETE SET NULL;
+
+UPDATE scad_deadlines d
+JOIN scad_subjects s ON s.name = TRIM(d.category)
+SET d.subject_id = s.id;
+
+ALTER TABLE scad_deadlines DROP COLUMN category;