feat: CV Batches system with AI extraction, matching, and slide-in chat

database.py

@@ -181,6 +181,61 @@ CREATE INDEX IF NOT EXISTS idx_certifications_candidate ON certifications(candid
 CREATE INDEX IF NOT EXISTS idx_generated_cvs_candidate ON generated_cvs(candidate_id);
 CREATE INDEX IF NOT EXISTS idx_generated_cvs_requirement ON generated_cvs(requirement_request_id);
 CREATE INDEX IF NOT EXISTS idx_chat_messages_conversation ON chat_messages(conversation_id);
+
+-- ============================================================
+-- CV BATCHES — group candidates for a specific requirement
+-- ============================================================
+
+-- Main batch table (one per requirement document or manual creation)
+CREATE TABLE IF NOT EXISTS cv_batches (
+    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    name VARCHAR(255) NOT NULL,
+    description TEXT,
+    -- Raw text of the uploaded requirements document (backend-only, AI use)
+    -- Null for manually created batches
+    requirements_text TEXT,
+    -- JSON array of positions extracted from the document
+    -- [{job_title, num_positions, required_skills, required_years, required_certs, description}]
+    positions JSONB DEFAULT '[]',
+    -- draft = still working, active = matching done, exported = CVs generated
+    status VARCHAR(50) DEFAULT 'draft',
+    created_at TIMESTAMPTZ DEFAULT NOW(),
+    updated_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+-- Batch items (candidates linked to a batch)
+CREATE TABLE IF NOT EXISTS batch_items (
+    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    batch_id UUID REFERENCES cv_batches(id) ON DELETE CASCADE,
+    candidate_id UUID REFERENCES candidates(id) ON DELETE CASCADE,
+    -- Which position in the batch this candidate is matched to (free text)
+    position_title VARCHAR(255),
+    -- AI match score 0-100
+    match_score INTEGER DEFAULT 0,
+    -- AI reasoning for the match
+    match_reasoning TEXT,
+    -- Realigned CV data (JSON — the reworded CV for this specific post)
+    realigned_cv_data JSONB,
+    -- proposed = AI suggested, approved = user confirmed, removed = user rejected
+    status VARCHAR(50) DEFAULT 'proposed',
+    -- Path to generated PDF after generation
+    generated_cv_path TEXT,
+    created_at TIMESTAMPTZ DEFAULT NOW(),
+    updated_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+-- Batch chat (messages per batch's discussion)
+CREATE TABLE IF NOT EXISTS batch_chat (
+    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    batch_id UUID REFERENCES cv_batches(id) ON DELETE CASCADE,
+    role VARCHAR(50) NOT NULL,    -- 'user' or 'assistant'
+    content TEXT NOT NULL,
+    created_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_batch_items_batch ON batch_items(batch_id);
+CREATE INDEX IF NOT EXISTS idx_batch_items_candidate ON batch_items(candidate_id);
+CREATE INDEX IF NOT EXISTS idx_batch_chat_batch ON batch_chat(batch_id);
 """