-- file: ks-store/migrations/0003_processing_ledger.sql
-- version: 2

-- Current processing ledger for canonical to core extraction and later pipeline stages.
-- This migration uses the current PostgreSQL schema from the active profile.

CREATE TABLE IF NOT EXISTS kb_sol_ops_processing_ledger (
    id BIGSERIAL,
    stage TEXT NOT NULL,
    processor_name TEXT NOT NULL,
    processor_version TEXT NOT NULL,
    input_key TEXT NOT NULL,
    input_hash TEXT NOT NULL,
    status TEXT NOT NULL,
    attempt_count INTEGER NOT NULL DEFAULT 0,
    started_at TIMESTAMPTZ,
    finished_at TIMESTAMPTZ,
    error_code TEXT,
    error_message TEXT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    CONSTRAINT pk_kb_sol_ops_processing_ledger PRIMARY KEY (id),
    CONSTRAINT ck_kb_sol_ops_processing_ledger_stage_not_empty CHECK (length(btrim(stage)) > 0),
    CONSTRAINT ck_kb_sol_ops_processing_ledger_processor_name_not_empty CHECK (length(btrim(processor_name)) > 0),
    CONSTRAINT ck_kb_sol_ops_processing_ledger_processor_version_not_empty CHECK (length(btrim(processor_version)) > 0),
    CONSTRAINT ck_kb_sol_ops_processing_ledger_input_key_not_empty CHECK (length(btrim(input_key)) > 0),
    CONSTRAINT ck_kb_sol_ops_processing_ledger_input_hash_not_empty CHECK (length(btrim(input_hash)) > 0),
    CONSTRAINT ck_kb_sol_ops_processing_ledger_status CHECK (status IN ('running', 'succeeded', 'failed')),
    CONSTRAINT ck_kb_sol_ops_processing_ledger_attempt_count_non_negative CHECK (attempt_count >= 0),
    CONSTRAINT ck_kb_sol_ops_processing_ledger_error_code_not_empty CHECK (error_code IS NULL OR length(btrim(error_code)) > 0),
    CONSTRAINT ck_kb_sol_ops_processing_ledger_error_message_not_empty CHECK (error_message IS NULL OR length(btrim(error_message)) > 0)
);

CREATE UNIQUE INDEX IF NOT EXISTS ux_kb_sol_ops_processing_ledger_identity
    ON kb_sol_ops_processing_ledger (stage, processor_name, processor_version, input_key);

CREATE INDEX IF NOT EXISTS ix_kb_sol_ops_processing_ledger_status
    ON kb_sol_ops_processing_ledger (stage, processor_name, status, updated_at);

CREATE INDEX IF NOT EXISTS ix_kb_sol_ops_processing_ledger_input_hash
    ON kb_sol_ops_processing_ledger (input_hash);