add backend

backend/sql/opengauss-init.sql

@@ -0,0 +1,46 @@
+CREATE TABLE IF NOT EXISTS portal_user (
+    id BIGSERIAL PRIMARY KEY,
+    username VARCHAR(64) NOT NULL UNIQUE,
+    email VARCHAR(128) NOT NULL UNIQUE,
+    password_hash VARCHAR(255) NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS portal_file (
+    id BIGSERIAL PRIMARY KEY,
+    user_id BIGINT NOT NULL REFERENCES portal_user (id),
+    filename VARCHAR(255) NOT NULL,
+    path VARCHAR(512) NOT NULL,
+    storage_name VARCHAR(255) NOT NULL,
+    content_type VARCHAR(255),
+    size BIGINT NOT NULL,
+    is_directory BOOLEAN NOT NULL DEFAULT FALSE,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT uk_portal_file_user_path_name UNIQUE (user_id, path, filename)
+);
+
+CREATE TABLE IF NOT EXISTS portal_course (
+    id BIGSERIAL PRIMARY KEY,
+    user_id BIGINT NOT NULL REFERENCES portal_user (id),
+    course_name VARCHAR(255) NOT NULL,
+    teacher VARCHAR(255),
+    classroom VARCHAR(255),
+    day_of_week INTEGER,
+    start_time INTEGER,
+    end_time INTEGER,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS portal_grade (
+    id BIGSERIAL PRIMARY KEY,
+    user_id BIGINT NOT NULL REFERENCES portal_user (id),
+    course_name VARCHAR(255) NOT NULL,
+    grade DOUBLE PRECISION NOT NULL,
+    semester VARCHAR(64) NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_user_created_at ON portal_user (created_at);
+CREATE INDEX IF NOT EXISTS idx_file_created_at ON portal_file (created_at);
+CREATE INDEX IF NOT EXISTS idx_course_user_created ON portal_course (user_id, created_at);
+CREATE INDEX IF NOT EXISTS idx_grade_user_created ON portal_grade (user_id, created_at);