-- AgentMessage: per-message record of the agent loop (queryable projection
-- alongside the transcript JSONL file, which remains the agent's read-back memory).
CREATE TABLE "AgentMessage" (
    "id" TEXT NOT NULL,
    "sessionId" TEXT NOT NULL,
    "runId" TEXT,
    "role" TEXT NOT NULL,
    "content" TEXT NOT NULL,
    "attachments" JSONB NOT NULL,
    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

    CONSTRAINT "AgentMessage_pkey" PRIMARY KEY ("id")
);

CREATE INDEX "AgentMessage_sessionId_createdAt_idx" ON "AgentMessage"("sessionId", "createdAt");
CREATE INDEX "AgentMessage_runId_idx" ON "AgentMessage"("runId");

ALTER TABLE "AgentMessage" ADD CONSTRAINT "AgentMessage_sessionId_fkey" FOREIGN KEY ("sessionId") REFERENCES "AgentSession"("id") ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE "AgentMessage" ADD CONSTRAINT "AgentMessage_runId_fkey" FOREIGN KEY ("runId") REFERENCES "AgentRun"("id") ON DELETE SET NULL ON UPDATE CASCADE;

-- AgentFileChange: file change captured during a run (write/rename/delete).
CREATE TABLE "AgentFileChange" (
    "id" TEXT NOT NULL,
    "runId" TEXT NOT NULL,
    "projectId" TEXT NOT NULL,
    "path" TEXT NOT NULL,
    "operation" TEXT NOT NULL,
    "beforeHash" TEXT,
    "afterHash" TEXT,
    "diff" TEXT,
    "metadata" JSONB NOT NULL,
    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

    CONSTRAINT "AgentFileChange_pkey" PRIMARY KEY ("id")
);

CREATE INDEX "AgentFileChange_runId_idx" ON "AgentFileChange"("runId");
CREATE INDEX "AgentFileChange_projectId_idx" ON "AgentFileChange"("projectId");
CREATE INDEX "AgentFileChange_path_idx" ON "AgentFileChange"("path");

ALTER TABLE "AgentFileChange" ADD CONSTRAINT "AgentFileChange_runId_fkey" FOREIGN KEY ("runId") REFERENCES "AgentRun"("id") ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE "AgentFileChange" ADD CONSTRAINT "AgentFileChange_projectId_fkey" FOREIGN KEY ("projectId") REFERENCES "Project"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- ProjectAgentLock: add heartbeatAt for liveness (A-5).
ALTER TABLE "ProjectAgentLock" ADD COLUMN "heartbeatAt" TIMESTAMP(3);