-- allium: 1
-- bDS SQLite Database Schema
-- Scope: core (Wave 1 — exact compatibility contract)
-- Distilled from: ../bDS/src/main/database/schema.ts
--
-- This document specifies the exact SQLite schema that the Rust
-- implementation must be able to read and write. It is the ground truth
-- for database compatibility.

-- ============================================================================
-- CORE ENTITIES
-- ============================================================================

entity Project {
    id: String              -- UUID v4
    name: String            -- Display name
    slug: String            -- URL-safe identifier
    description: String?    -- Optional description
    data_path: String?      -- Custom data directory (null = default)
    created_at: Timestamp   -- Unix timestamp
    updated_at: Timestamp   -- Unix timestamp
    is_active: Boolean      -- Exactly one project is active at a time
}

entity Post {
    id: String              -- UUID v4
    project_id: String
    title: String
    slug: String            -- URL-friendly identifier
    excerpt: String?        -- Optional summary
    content: String?        -- Draft body (null when published)
    status: draft | published | archived
    author: String?         -- Author name
    created_at: Timestamp
    updated_at: Timestamp
    published_at: Timestamp?
    file_path: String       -- Empty for never-published drafts
    checksum: String?       -- SHA-256 of content
    tags: Set<String>       -- JSON array stored as text
    categories: Set<String> -- JSON array stored as text
    template_slug: String?  -- User template override
    language: String?       -- ISO 639-1 code
    do_not_translate: Boolean

    -- Legacy columns (read-only, no longer written)
    published_title: String?
    published_content: String?
    published_tags: String?
    published_categories: String?
    published_excerpt: String?
}

entity PostTranslation {
    id: String              -- UUID v4
    project_id: String
    translation_for: String -- Canonical post ID
    language: String        -- ISO 639-1 code
    title: String
    excerpt: String?
    content: String?        -- Draft body (null when published)
    status: draft | published | archived
    created_at: Timestamp
    updated_at: Timestamp
    published_at: Timestamp?
    file_path: String
    checksum: String?
}

entity Media {
    id: String              -- UUID v4
    project_id: String
    filename: String        -- Generated filename
    original_name: String   -- Original uploaded filename
    mime_type: String       -- e.g. "image/jpeg"
    size: Integer           -- Bytes
    width: Integer?         -- Image dimensions
    height: Integer?
    title: String?
    alt: String?
    caption: String?
    author: String?
    file_path: String       -- Absolute path to binary
    sidecar_path: String    -- Path to .meta sidecar file
    created_at: Timestamp
    updated_at: Timestamp
    checksum: String?
    tags: Set<String>       -- JSON array stored as text
    language: String?       -- ISO 639-1 code
}

entity MediaTranslation {
    id: String              -- UUID v4
    project_id: String
    translation_for: String -- Canonical media ID
    language: String        -- ISO 639-1 code
    title: String?
    alt: String?
    caption: String?
    created_at: Timestamp
    updated_at: Timestamp
}

entity Tag {
    id: String              -- UUID v4
    project_id: String
    name: String            -- Case-insensitive unique per project
    color: String?          -- Hex color like #ff0000
    post_template_slug: String?  -- Template override for this tag
    created_at: Timestamp
    updated_at: Timestamp
}

entity Template {
    id: String              -- UUID v4
    project_id: String
    slug: String            -- URL-safe identifier
    title: String
    kind: post | list | not_found | partial
    enabled: Boolean
    version: Integer        -- Incremented on each update
    file_path: String       -- templates/{slug}.liquid
    status: draft | published
    content: String?        -- Draft body (null when published)
    created_at: Timestamp
    updated_at: Timestamp
}

entity Script {
    id: String              -- UUID v4
    project_id: String
    slug: String            -- URL-safe identifier
    title: String
    kind: macro | utility | transform
    entrypoint: String      -- Default: "render" for macros
    enabled: Boolean
    version: Integer        -- Incremented on each update
    file_path: String       -- scripts/{slug}.lua (Rust) / {slug}.py (TS)
    status: draft | published
    content: String?        -- Draft body (null when published)
    created_at: Timestamp
    updated_at: Timestamp
}

-- ============================================================================
-- RELATIONSHIP TABLES
-- ============================================================================

entity PostLink {
    id: String              -- UUID v4
    source_post_id: String  -- Post containing the link
    target_post_id: String  -- Post being linked to
    link_text: String?      -- Anchor text
    created_at: Timestamp
}

entity PostMediaLink {
    id: String              -- UUID v4
    project_id: String
    post_id: String
    media_id: String
    sort_order: Integer     -- For ordering media within a post
    created_at: Timestamp
}

-- ============================================================================
-- METADATA TABLES
-- ============================================================================

entity Setting {
    key: String             -- Primary key
    value: String           -- Serialized value
    updated_at: Timestamp
}

entity GeneratedFileHash {
    project_id: String
    relative_path: String
    content_hash: String    -- SHA-256 of file content
    updated_at: Timestamp
}

-- ============================================================================
-- SEARCH INDEX (FTS5 Virtual Tables)
-- ============================================================================

entity PostSearchIndex {
    -- SQLite FTS5 virtual table, not a real entity
    -- Created via: CREATE VIRTUAL TABLE posts_fts USING fts5(...)
    -- Indexed fields: title, excerpt, content, tags, categories
    -- Plus all translation titles, excerpts, and content
    post: Post
    stemmed_content: String  -- Processed via Snowball stemmer
}

entity MediaSearchIndex {
    -- SQLite FTS5 virtual table
    -- Created via: CREATE VIRTUAL TABLE media_fts USING fts5(...)
    -- Indexed fields: title, alt, caption, original_name, tags
    -- Plus all translation titles, alts, and captions
    media: Media
    stemmed_content: String  -- Processed via Snowball stemmer
}

-- ============================================================================
-- AI / CHAT TABLES
-- ============================================================================

entity ChatConversation {
    id: String              -- UUID v4
    title: String
    model: String?          -- Model used for conversation
    copilot_session_id: String?  -- Legacy, no longer used
    created_at: Timestamp
    updated_at: Timestamp
}

entity ChatMessage {
    id: Integer             -- Auto-increment
    conversation_id: String
    role: system | user | assistant | tool
    content: String?
    tool_call_id: String?   -- For tool responses
    tool_calls: String?     -- JSON array of tool calls
    created_at: Timestamp
}

entity AiProvider {
    id: String              -- Provider key (e.g., "opencode", "mistral")
    name: String            -- Display name
    env: String?            -- JSON array of env var names
    npm: String?            -- Primary npm package
    api: String?            -- API base URL
    doc: String?            -- Documentation URL
    updated_at: Timestamp
}

entity AiModel {
    provider: String        -- FK → ai_providers.id
    model_id: String
    name: String            -- Display name
    family: String?         -- Model family (e.g., "claude-sonnet")
    attachment: Boolean     -- Supports attachments
    reasoning: Boolean      -- Supports reasoning
    tool_call: Boolean      -- Supports tool calls
    structured_output: Boolean
    temperature: Boolean    -- Temperature control supported
    knowledge: String?      -- Knowledge cutoff date
    release_date: String?
    last_updated_date: String?
    open_weights: Boolean
    input_price: Integer?   -- USD per 1M input tokens (in cents)
    output_price: Integer?  -- USD per 1M output tokens (in cents)
    cache_read_price: Integer?
    cache_write_price: Integer?
    context_window: Integer -- Max context tokens
    max_input_tokens: Integer
    max_output_tokens: Integer
    interleaved: String?    -- JSON object for interleaved fields
    status: String?         -- e.g., "deprecated"
    provider_npm: String?   -- Per-model npm override
    updated_at: Timestamp
}

entity AiModelModality {
    provider: String
    model_id: String
    direction: String       -- "input" | "output"
    modality: String        -- "text" | "image" | "pdf" | "audio" | "video"
}

entity AiCatalogMeta {
    key: String             -- "etag" | "lastFetchedAt"
    value: String
}

-- ============================================================================
-- EMBEDDINGS TABLES
-- ============================================================================

entity EmbeddingKey {
    label: Integer          -- USearch bigint key
    post_id: String
    project_id: String
    content_hash: String    -- SHA-256 of title+content
    vector: String          -- Base64-encoded Float32Array bytes (1536 bytes for 384-dim)
}

entity DismissedDuplicatePair {
    id: String              -- UUID v4
    project_id: String
    post_id_a: String
    post_id_b: String
    dismissed_at: Timestamp
}

-- ============================================================================
-- IMPORT TABLES
-- ============================================================================

entity ImportDefinition {
    id: String              -- UUID v4
    project_id: String
    name: String
    wxr_file_path: String?  -- WordPress XML export file
    uploads_folder_path: String?  -- WordPress uploads directory
    last_analysis_result: String?  -- JSON text of ImportAnalysisReport
    created_at: Timestamp
    updated_at: Timestamp
}

-- ============================================================================
-- NOTIFICATION TABLES
-- ============================================================================

entity DbNotification {
    id: Integer             -- Auto-increment
    entity_type: String     -- 'post' | 'media' | 'script' | 'template'
    entity_id: String
    action: created | updated | deleted
    from_cli: Boolean       -- 1 = written by CLI
    seen_at: Timestamp?     -- NULL = unprocessed
    created_at: Timestamp
}

-- ============================================================================
-- SCHEMA CONSTRAINTS AND INDEXES
-- ============================================================================

invariant UniqueProjectSlug {
    -- projects.slug must be unique across all projects
}

invariant UniquePostSlugPerProject {
    -- posts.slug must be unique within each project.project_id
    -- Enforced by: posts_project_slug_idx unique index
}

invariant UniqueTranslationPerPostLanguage {
    -- post_translations must have unique (translation_for, language)
    -- Enforced by: post_translations_translation_language_idx
}

invariant UniqueMediaTranslationPerMediaLanguage {
    -- media_translations must have unique (translation_for, language)
    -- Enforced by: media_translations_translation_language_idx
}

invariant UniqueTagNamePerProject {
    -- tags.name must be unique within each project.project_id
    -- Enforced by: tags_project_name_idx unique index
}

invariant UniqueScriptSlugPerProject {
    -- scripts.slug must be unique within each project.project_id
    -- Enforced by: scripts_project_slug_idx unique index
}

invariant UniqueTemplateSlugPerProject {
    -- templates.slug must be unique within each project.project_id
    -- Enforced by: templates_project_slug_idx unique index
}

invariant UniquePostMediaLink {
    -- post_media must have unique (post_id, media_id) pair
    -- Enforced by: post_media_post_media_idx unique index
}

invariant UniqueGeneratedFileHash {
    -- generated_file_hashes must have unique (project_id, relative_path)
    -- Enforced by: generated_file_hashes_project_path_idx unique index
}

invariant UniqueDismissedDuplicatePair {
    -- dismissed_duplicate_pairs must have unique (project_id, post_id_a, post_id_b)
    -- Enforced by: dismissed_pairs_idx unique index
}

-- ============================================================================
-- FTS5 VIRTUAL TABLE SCHEMAS (Snowball Stemmer Integration)
-- ============================================================================

value Fts5PostSchema {
    -- CREATE VIRTUAL TABLE posts_fts USING fts5(
    --   title, excerpt, content, tags, categories,
    --   content='posts',
    --   content_rowid='rowid'
    -- );
    fields: Set<String>     -- {title, excerpt, content, tags, categories}
    stemmer_languages: Integer = 24
}

value Fts5MediaSchema {
    -- CREATE VIRTUAL TABLE media_fts USING fts5(
    --   title, alt, caption, original_name, tags,
    --   content='media',
    --   content_rowid='rowid'
    -- );
    fields: Set<String>     -- {title, alt, caption, original_name, tags}
    stemmer_languages: Integer = 24
}

-- ============================================================================
-- MIGRATION HISTORY
-- ============================================================================

value MigrationVersion {
    -- Schema version tracking via refinery migrations
    -- Current version: 0007 (scripts and templates draft lifecycle)
    -- Migration files located in: migrations/
    -- Note: Migration list documented in comments, not as Allium value
}