clean up code

sql/migrations/003_content_graph.sql

@@ -0,0 +1,76 @@
+CREATE TABLE IF NOT EXISTS content_nodes (
+    id UUID DEFAULT gen_random_uuid() PRIMARY KEY,
+    node_type VARCHAR(50) NOT NULL,
+    path TEXT NOT NULL,
+    disk_label VARCHAR(50),
+    parent_id UUID REFERENCES content_nodes(id) ON DELETE CASCADE,
+
+    checksum VARCHAR(64),
+    size BIGINT,
+    modified_time TIMESTAMP,
+
+    content_hash VARCHAR(64),
+    extracted_at TIMESTAMP,
+    extraction_method VARCHAR(100),
+
+    metadata JSONB,
+
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+
+    UNIQUE(node_type, path, disk_label)
+);
+
+CREATE INDEX IF NOT EXISTS idx_content_nodes_type ON content_nodes(node_type);
+CREATE INDEX IF NOT EXISTS idx_content_nodes_path ON content_nodes(path);
+CREATE INDEX IF NOT EXISTS idx_content_nodes_parent ON content_nodes(parent_id);
+CREATE INDEX IF NOT EXISTS idx_content_nodes_checksum ON content_nodes(checksum);
+CREATE INDEX IF NOT EXISTS idx_content_nodes_content_hash ON content_nodes(content_hash);
+
+CREATE TABLE IF NOT EXISTS content_edges (
+    id UUID DEFAULT gen_random_uuid() PRIMARY KEY,
+    source_id UUID NOT NULL REFERENCES content_nodes(id) ON DELETE CASCADE,
+    target_id UUID NOT NULL REFERENCES content_nodes(id) ON DELETE CASCADE,
+    edge_type VARCHAR(50) NOT NULL,
+
+    metadata JSONB,
+    confidence FLOAT,
+
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+
+    UNIQUE(source_id, target_id, edge_type)
+);
+
+CREATE INDEX IF NOT EXISTS idx_content_edges_source ON content_edges(source_id);
+CREATE INDEX IF NOT EXISTS idx_content_edges_target ON content_edges(target_id);
+CREATE INDEX IF NOT EXISTS idx_content_edges_type ON content_edges(edge_type);
+
+CREATE TABLE IF NOT EXISTS extraction_log (
+    id UUID DEFAULT gen_random_uuid() PRIMARY KEY,
+    node_id UUID REFERENCES content_nodes(id) ON DELETE CASCADE,
+    file_path TEXT NOT NULL,
+    file_checksum VARCHAR(64),
+
+    extraction_method VARCHAR(100),
+    status VARCHAR(50),
+    error_message TEXT,
+
+    extracted_size BIGINT,
+    processing_time_ms INT,
+
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_extraction_log_node ON extraction_log(node_id);
+CREATE INDEX IF NOT EXISTS idx_extraction_log_file ON extraction_log(file_path);
+CREATE INDEX IF NOT EXISTS idx_extraction_log_checksum ON extraction_log(file_checksum);
+CREATE INDEX IF NOT EXISTS idx_extraction_log_status ON extraction_log(status);
+CREATE INDEX IF NOT EXISTS idx_extraction_log_created ON extraction_log(created_at DESC);
+
+COMMENT ON TABLE content_nodes IS 'Content graph nodes: directories, files, chunks';
+COMMENT ON TABLE content_edges IS 'Content graph edges: contains, derived_from, references, duplicates';
+COMMENT ON TABLE extraction_log IS 'Tracks extraction history for incremental updates';
+
+COMMENT ON COLUMN content_nodes.node_type IS 'directory, file, chunk, embedding';
+COMMENT ON COLUMN content_nodes.content_hash IS 'Hash of extracted content (not file bytes)';
+COMMENT ON COLUMN content_edges.edge_type IS 'contains, derived_from, references, duplicates, similar_to';