refactor (v2): better arch

Co-authored-by: Copilot <copilot@github.com>

crates/adapters/sqlite/migrations/20241223000000_initial_schema.sql

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+-- Initial schema for K-Notes
+-- SQLite with FTS5 for full-text search
+
+-- Users table (OIDC-ready)
+CREATE TABLE IF NOT EXISTS users (
+    id TEXT PRIMARY KEY NOT NULL,
+    subject TEXT UNIQUE NOT NULL,  -- OIDC subject identifier
+    email TEXT NOT NULL,
+    created_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+CREATE INDEX idx_users_subject ON users(subject);
+CREATE INDEX idx_users_email ON users(email);
+
+-- Notes table
+CREATE TABLE IF NOT EXISTS notes (
+    id TEXT PRIMARY KEY NOT NULL,
+    user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    title TEXT NOT NULL,
+    content TEXT NOT NULL DEFAULT '',
+    is_pinned INTEGER NOT NULL DEFAULT 0,
+    is_archived INTEGER NOT NULL DEFAULT 0,
+    created_at TEXT NOT NULL DEFAULT (datetime('now')),
+    updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+CREATE INDEX idx_notes_user_id ON notes(user_id);
+CREATE INDEX idx_notes_is_pinned ON notes(is_pinned);
+CREATE INDEX idx_notes_is_archived ON notes(is_archived);
+CREATE INDEX idx_notes_updated_at ON notes(updated_at);
+
+-- Tags table (user-scoped)
+CREATE TABLE IF NOT EXISTS tags (
+    id TEXT PRIMARY KEY NOT NULL,
+    name TEXT NOT NULL,
+    user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    UNIQUE(name, user_id)
+);
+
+CREATE INDEX idx_tags_user_id ON tags(user_id);
+
+-- Junction table for note-tag relationship
+CREATE TABLE IF NOT EXISTS note_tags (
+    note_id TEXT NOT NULL REFERENCES notes(id) ON DELETE CASCADE,
+    tag_id TEXT NOT NULL REFERENCES tags(id) ON DELETE CASCADE,
+    PRIMARY KEY (note_id, tag_id)
+);
+
+CREATE INDEX idx_note_tags_tag_id ON note_tags(tag_id);
+
+-- Full-text search virtual table
+CREATE VIRTUAL TABLE IF NOT EXISTS notes_fts USING fts5(
+    title,
+    content,
+    content='notes',
+    content_rowid='rowid'
+);
+
+-- Triggers to keep FTS index in sync
+CREATE TRIGGER notes_ai AFTER INSERT ON notes BEGIN
+    INSERT INTO notes_fts(rowid, title, content) VALUES (NEW.rowid, NEW.title, NEW.content);
+END;
+
+CREATE TRIGGER notes_ad AFTER DELETE ON notes BEGIN
+    INSERT INTO notes_fts(notes_fts, rowid, title, content) VALUES('delete', OLD.rowid, OLD.title, OLD.content);
+END;
+
+CREATE TRIGGER notes_au AFTER UPDATE ON notes BEGIN
+    INSERT INTO notes_fts(notes_fts, rowid, title, content) VALUES('delete', OLD.rowid, OLD.title, OLD.content);
+    INSERT INTO notes_fts(rowid, title, content) VALUES (NEW.rowid, NEW.title, NEW.content);
+END;

crates/adapters/sqlite/migrations/20241223000001_add_password_hash.sql

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+-- Add password_hash column to users table
+ALTER TABLE users ADD COLUMN password_hash TEXT;

crates/adapters/sqlite/migrations/20241223000002_add_color_to_notes.sql

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+ALTER TABLE notes ADD COLUMN color TEXT NOT NULL DEFAULT 'DEFAULT';

crates/adapters/sqlite/migrations/20251223030000_add_note_versions.sql

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+-- Add note_versions table
+CREATE TABLE note_versions (
+    id TEXT PRIMARY KEY,
+    note_id TEXT NOT NULL,
+    title TEXT NOT NULL,
+    content TEXT NOT NULL,
+    created_at TEXT NOT NULL,
+    FOREIGN KEY(note_id) REFERENCES notes(id) ON DELETE CASCADE
+);
+
+CREATE INDEX idx_note_versions_note_id ON note_versions(note_id);

crates/adapters/sqlite/migrations/20251226000000_create_note_links.sql

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+CREATE TABLE IF NOT EXISTS note_links (
+    source_note_id TEXT NOT NULL,
+    target_note_id TEXT NOT NULL,
+    score REAL NOT NULL,
+    created_at DATETIME NOT NULL,
+    PRIMARY KEY (source_note_id, target_note_id),
+    FOREIGN KEY (source_note_id) REFERENCES notes(id) ON DELETE CASCADE,
+    FOREIGN KEY (target_note_id) REFERENCES notes(id) ON DELETE CASCADE
+);
+
+CREATE INDEX idx_note_links_source ON note_links(source_note_id);
+CREATE INDEX idx_note_links_target ON note_links(target_note_id);

crates/adapters/sqlite/migrations/20251231000000_nullable_title.sql

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+-- Allow NULL titles in notes table
+-- SQLite doesn't support ALTER COLUMN, so we need to recreate the table
+
+-- Step 1: Create new table with nullable title
+CREATE TABLE notes_new (
+    id TEXT PRIMARY KEY NOT NULL,
+    user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    title TEXT,  -- Now nullable
+    content TEXT NOT NULL DEFAULT '',
+    color TEXT NOT NULL DEFAULT 'DEFAULT',
+    is_pinned INTEGER NOT NULL DEFAULT 0,
+    is_archived INTEGER NOT NULL DEFAULT 0,
+    created_at TEXT NOT NULL DEFAULT (datetime('now')),
+    updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+-- Step 2: Copy data from old table
+INSERT INTO notes_new (id, user_id, title, content, color, is_pinned, is_archived, created_at, updated_at)
+SELECT id, user_id, title, content, color, is_pinned, is_archived, created_at, updated_at FROM notes;
+
+-- Step 3: Drop old table
+DROP TABLE notes;
+
+-- Step 4: Rename new table
+ALTER TABLE notes_new RENAME TO notes;
+
+-- Step 5: Recreate indexes
+CREATE INDEX idx_notes_user_id ON notes(user_id);
+CREATE INDEX idx_notes_is_pinned ON notes(is_pinned);
+CREATE INDEX idx_notes_is_archived ON notes(is_archived);
+CREATE INDEX idx_notes_updated_at ON notes(updated_at);
+
+-- Step 6: Recreate FTS triggers
+CREATE TRIGGER notes_ai AFTER INSERT ON notes BEGIN
+    INSERT INTO notes_fts(rowid, title, content) VALUES (NEW.rowid, COALESCE(NEW.title, ''), NEW.content);
+END;
+
+CREATE TRIGGER notes_ad AFTER DELETE ON notes BEGIN
+    INSERT INTO notes_fts(notes_fts, rowid, title, content) VALUES('delete', OLD.rowid, COALESCE(OLD.title, ''), OLD.content);
+END;
+
+CREATE TRIGGER notes_au AFTER UPDATE ON notes BEGIN
+    INSERT INTO notes_fts(notes_fts, rowid, title, content) VALUES('delete', OLD.rowid, COALESCE(OLD.title, ''), OLD.content);
+    INSERT INTO notes_fts(rowid, title, content) VALUES (NEW.rowid, COALESCE(NEW.title, ''), NEW.content);
+END;

crates/adapters/sqlite/migrations/20251231000001_nullable_note_version_title.sql

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+-- note_versions.title should be nullable to match notes where title is optional
+CREATE TABLE note_versions_new (
+    id TEXT PRIMARY KEY,
+    note_id TEXT NOT NULL,
+    title TEXT,
+    content TEXT NOT NULL,
+    created_at TEXT NOT NULL,
+    FOREIGN KEY(note_id) REFERENCES notes(id) ON DELETE CASCADE
+);
+
+INSERT INTO note_versions_new SELECT id, note_id, NULLIF(title, ''), content, created_at FROM note_versions;
+
+DROP TABLE note_versions;
+ALTER TABLE note_versions_new RENAME TO note_versions;
+
+CREATE INDEX idx_note_versions_note_id ON note_versions(note_id);