feat: add survey_invites migration and invite_id FK

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/alembic/versions/047_add_survey_invites_table.py

@@ -0,0 +1,39 @@
+"""Add survey_invites table and invite_id FK on survey_responses.
+
+Revision ID: 047
+Revises: 046
+Create Date: 2026-03-04
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects.postgresql import UUID
+
+revision: str = "047"
+down_revision: str = "046"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "survey_invites",
+        sa.Column("id", UUID(as_uuid=True), primary_key=True),
+        sa.Column("token", sa.String(32), unique=True, nullable=False),
+        sa.Column("recipient_name", sa.String(255), nullable=False),
+        sa.Column("recipient_email", sa.String(255), nullable=True),
+        sa.Column("status", sa.String(20), nullable=False, server_default="pending"),
+        sa.Column("email_sent", sa.Boolean, nullable=False, server_default="false"),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
+        sa.Column("completed_at", sa.DateTime(timezone=True), nullable=True),
+    )
+    op.add_column(
+        "survey_responses",
+        sa.Column("invite_id", UUID(as_uuid=True), sa.ForeignKey("survey_invites.id"), nullable=True),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("survey_responses", "invite_id")
+    op.drop_table("survey_invites")

backend/app/models/survey_response.py

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+"""FlowPilot survey response storage."""
+import uuid
+from datetime import datetime, timezone
+
+from sqlalchemy import Column, DateTime, ForeignKey, String, Text
+from sqlalchemy.dialects.postgresql import JSONB, UUID
+
+from app.core.database import Base
+
+
+class SurveyResponse(Base):
+    __tablename__ = "survey_responses"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    respondent_name = Column(String(255), nullable=True)
+    responses = Column(JSONB, nullable=False)
+    ip_address = Column(String(45), nullable=True)
+    user_agent = Column(Text, nullable=True)
+    invite_id = Column(UUID(as_uuid=True), ForeignKey("survey_invites.id"), nullable=True)
+    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc), nullable=False)