chore: merge Rust backend into monorepo

git-subtree-dir: server
git-subtree-mainline: fb6a84d75f
git-subtree-split: 8a88706ff9

server/migrations/0001_initial_schema.sql

@@ -0,0 +1,45 @@
+CREATE TABLE student_profiles (
+  id UUID PRIMARY KEY,
+  owner_id UUID NOT NULL,
+  name VARCHAR(20) NOT NULL CHECK (char_length(btrim(name)) BETWEEN 1 AND 20),
+  grade VARCHAR(40) NOT NULL CHECK (char_length(btrim(grade)) > 0),
+  subject VARCHAR(40) NOT NULL CHECK (char_length(btrim(subject)) > 0),
+  academic_year SMALLINT NOT NULL CHECK (academic_year BETWEEN 2000 AND 2200),
+  term VARCHAR(1) NOT NULL CHECK (term IN ('春', '暑', '秋', '寒')),
+  guardian_title VARCHAR(24) NOT NULL CHECK (char_length(btrim(guardian_title)) BETWEEN 1 AND 24),
+  start_time CHAR(5) NOT NULL,
+  end_time CHAR(5) NOT NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX student_profiles_owner_updated_idx
+  ON student_profiles (owner_id, updated_at DESC);
+
+CREATE INDEX student_profiles_owner_grade_subject_idx
+  ON student_profiles (owner_id, grade, subject);
+
+CREATE TABLE student_profile_defaults (
+  owner_id UUID PRIMARY KEY,
+  grade VARCHAR(40) NOT NULL CHECK (char_length(btrim(grade)) > 0),
+  subject VARCHAR(40) NOT NULL CHECK (char_length(btrim(subject)) > 0),
+  lesson_duration_minutes SMALLINT NOT NULL
+    CHECK (lesson_duration_minutes BETWEEN 15 AND 360 AND lesson_duration_minutes % 15 = 0),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE feedback_records (
+  id UUID PRIMARY KEY,
+  owner_id UUID NOT NULL,
+  profile_id UUID REFERENCES student_profiles(id) ON DELETE SET NULL,
+  feedback_date DATE NOT NULL,
+  content TEXT NOT NULL CHECK (char_length(btrim(content)) > 0),
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX feedback_records_owner_date_idx
+  ON feedback_records (owner_id, feedback_date DESC, updated_at DESC);
+
+CREATE INDEX feedback_records_owner_profile_idx
+  ON feedback_records (owner_id, profile_id);