import uuid
from datetime import UTC, datetime

from pgvector.sqlalchemy import Vector
from sqlalchemy import (
    JSON,
    Boolean,
    Column,
    DateTime,
    Enum,
    Float,
    ForeignKey,
    Index,
    Integer,
    String,
    Table,
    Text,
    UniqueConstraint,
    and_,
    func,
    text,
)
from sqlalchemy.orm import declarative_base, relationship

from api.constants import DEFAULT_CAMPAIGN_RETRY_CONFIG

from ..enums import (
    CallType,
    IntegrationAction,
    ToolCategory,
    ToolStatus,
    TriggerState,
    WebhookCredentialType,
    WorkflowRunState,
    WorkflowStatus,
)

Base = declarative_base()


# TODO: remove workflow_defintion after migration, remove nullable workflow_defintion_id from Workflow and Workflowrun


# Association table for many-to-many relationship between users and organizations
organization_users_association = Table(
    "organization_users",
    Base.metadata,
    Column("user_id", Integer, ForeignKey("users.id"), primary_key=True),
    Column(
        "organization_id", Integer, ForeignKey("organizations.id"), primary_key=True
    ),
)


class UserModel(Base):
    __tablename__ = "users"
    id = Column(Integer, primary_key=True, index=True)
    provider_id = Column(String, unique=True, index=True, nullable=False)
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    workflows = relationship("WorkflowModel", back_populates="user")
    selected_organization_id = Column(
        Integer, ForeignKey("organizations.id"), nullable=True
    )
    selected_organization = relationship("OrganizationModel", back_populates="users")
    organizations = relationship(
        "OrganizationModel",
        secondary=organization_users_association,
        back_populates="users",
    )
    is_superuser = Column(Boolean, default=False)
    email = Column(String, nullable=True)
    password_hash = Column(String, nullable=True)

    __table_args__ = (
        Index(
            "ix_users_email_lower",
            func.lower(email),
            unique=True,
            postgresql_where=text("email IS NOT NULL"),
        ),
    )


class UserConfigurationModel(Base):
    """Per-user keyed JSON store, mirroring organization_configurations.

    Keys are defined in UserConfigurationKey. The legacy v1 AI model
    configuration lives under MODEL_CONFIGURATION; last_validated_at is only
    meaningful for that key.
    """

    __tablename__ = "user_configurations"
    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=True)
    key = Column(String, nullable=False)
    configuration = Column(JSON, nullable=False, default=dict)
    last_validated_at = Column(DateTime(timezone=True), nullable=True)

    __table_args__ = (
        UniqueConstraint("user_id", "key", name="_user_configuration_key_uc"),
    )


# New Organization model
class OrganizationModel(Base):
    __tablename__ = "organizations"

    id = Column(Integer, primary_key=True, index=True)
    provider_id = Column(String, unique=True, index=True, nullable=False)
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))

    # Deprecated: MPS owns quota and credit ledger state.
    quota_type = Column(
        Enum("monthly", "annual", name="quota_type"),
        nullable=False,
        default="monthly",
        server_default=text("'monthly'::quota_type"),
        comment="Deprecated. MPS owns quota and credit ledger state.",
        info={"deprecated": True},
    )
    quota_dograh_tokens = Column(
        Integer,
        nullable=False,
        default=0,
        server_default=text("0"),
        comment="Deprecated. MPS owns quota and credit ledger state.",
        info={"deprecated": True},
    )
    quota_reset_day = Column(
        Integer,
        nullable=False,
        default=1,
        server_default=text("1"),
        comment="Deprecated. MPS owns quota and credit ledger state.",
        info={"deprecated": True},
    )
    quota_start_date = Column(
        DateTime(timezone=True),
        nullable=True,
        comment="Deprecated. MPS owns quota and credit ledger state.",
        info={"deprecated": True},
    )
    quota_enabled = Column(
        Boolean,
        nullable=False,
        default=False,
        server_default=text("false"),
        comment="Deprecated. MPS owns quota and credit ledger state.",
        info={"deprecated": True},
    )

    price_per_second_usd = Column(Float, nullable=True)

    # Relationships
    users = relationship(
        "UserModel",
        secondary=organization_users_association,
        back_populates="organizations",
    )
    integrations = relationship("IntegrationModel", back_populates="organization")
    usage_cycles = relationship(
        "OrganizationUsageCycleModel", back_populates="organization"
    )
    configurations = relationship(
        "OrganizationConfigurationModel", back_populates="organization"
    )
    api_keys = relationship("APIKeyModel", back_populates="organization")


class APIKeyModel(Base):
    __tablename__ = "api_keys"

    id = Column(Integer, primary_key=True, index=True)
    organization_id = Column(
        Integer, ForeignKey("organizations.id", ondelete="CASCADE"), nullable=False
    )
    name = Column(String, nullable=False)
    key_hash = Column(String, nullable=False, unique=True, index=True)
    key_prefix = Column(String, nullable=False)  # Store first 8 chars for display
    is_active = Column(Boolean, default=True, nullable=False)
    created_by = Column(Integer, ForeignKey("users.id"), nullable=True)
    last_used_at = Column(DateTime(timezone=True), nullable=True)
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    archived_at = Column(DateTime(timezone=True), nullable=True)

    # Relationships
    organization = relationship("OrganizationModel", back_populates="api_keys")
    created_by_user = relationship("UserModel")

    # Indexes for performance
    __table_args__ = (
        Index("ix_api_keys_organization_id", "organization_id"),
        Index("ix_api_keys_key_hash", "key_hash"),
        Index("ix_api_keys_active", "is_active"),
    )


class OrganizationConfigurationModel(Base):
    __tablename__ = "organization_configurations"

    id = Column(Integer, primary_key=True, index=True)
    organization_id = Column(
        Integer, ForeignKey("organizations.id", ondelete="CASCADE"), nullable=False
    )
    key = Column(String, nullable=False)
    value = Column(JSON, nullable=False, default=dict)
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    updated_at = Column(
        DateTime(timezone=True),
        default=lambda: datetime.now(UTC),
        onupdate=lambda: datetime.now(UTC),
    )

    # Relationships
    organization = relationship("OrganizationModel", back_populates="configurations")

    # Constraints and indexes
    __table_args__ = (
        UniqueConstraint("organization_id", "key", name="_organization_key_uc"),
        Index("ix_organization_configurations_organization_id", "organization_id"),
    )


class TelephonyConfigurationModel(Base):
    __tablename__ = "telephony_configurations"

    id = Column(Integer, primary_key=True, index=True)
    organization_id = Column(
        Integer, ForeignKey("organizations.id", ondelete="CASCADE"), nullable=False
    )
    name = Column(String(64), nullable=False)
    provider = Column(String(32), nullable=False)
    credentials = Column(JSON, nullable=False, default=dict)
    is_default_outbound = Column(
        Boolean, nullable=False, default=False, server_default=text("false")
    )
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    updated_at = Column(
        DateTime(timezone=True),
        default=lambda: datetime.now(UTC),
        onupdate=lambda: datetime.now(UTC),
    )

    organization = relationship("OrganizationModel")
    phone_numbers = relationship(
        "TelephonyPhoneNumberModel",
        back_populates="configuration",
        cascade="all, delete-orphan",
    )

    __table_args__ = (
        UniqueConstraint(
            "organization_id", "name", name="uq_telephony_configurations_org_name"
        ),
        Index("ix_telephony_configurations_org", "organization_id"),
        Index(
            "uq_telephony_configurations_default",
            "organization_id",
            unique=True,
            postgresql_where=text("is_default_outbound = true"),
        ),
    )


class TelephonyPhoneNumberModel(Base):
    __tablename__ = "telephony_phone_numbers"

    id = Column(Integer, primary_key=True, index=True)
    organization_id = Column(
        Integer, ForeignKey("organizations.id", ondelete="CASCADE"), nullable=False
    )
    telephony_configuration_id = Column(
        Integer,
        ForeignKey("telephony_configurations.id", ondelete="CASCADE"),
        nullable=False,
    )
    address = Column(String(255), nullable=False)
    address_normalized = Column(String(255), nullable=False)
    address_type = Column(String(16), nullable=False)
    country_code = Column(String(2), nullable=True)
    label = Column(String(64), nullable=True)
    inbound_workflow_id = Column(
        Integer,
        ForeignKey("workflows.id", ondelete="SET NULL"),
        nullable=True,
    )
    is_active = Column(
        Boolean, nullable=False, default=True, server_default=text("true")
    )
    is_default_caller_id = Column(
        Boolean, nullable=False, default=False, server_default=text("false")
    )
    extra_metadata = Column(
        JSON, nullable=False, default=dict, server_default=text("'{}'::json")
    )
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    updated_at = Column(
        DateTime(timezone=True),
        default=lambda: datetime.now(UTC),
        onupdate=lambda: datetime.now(UTC),
    )

    configuration = relationship(
        "TelephonyConfigurationModel", back_populates="phone_numbers"
    )
    inbound_workflow = relationship("WorkflowModel")

    __table_args__ = (
        UniqueConstraint(
            "organization_id",
            "address_normalized",
            name="uq_phone_numbers_org_address",
        ),
        Index("ix_phone_numbers_config", "telephony_configuration_id"),
        Index(
            "ix_phone_numbers_workflow",
            "inbound_workflow_id",
            postgresql_where=text("inbound_workflow_id IS NOT NULL"),
        ),
        Index(
            "ix_phone_numbers_inbound_lookup",
            "address_normalized",
            "organization_id",
            postgresql_where=text("is_active = true"),
        ),
        Index(
            "uq_phone_numbers_default_caller",
            "telephony_configuration_id",
            unique=True,
            postgresql_where=text("is_default_caller_id = true"),
        ),
    )


class IntegrationModel(Base):
    __tablename__ = "integrations"

    id = Column(Integer, primary_key=True, index=True)
    integration_id = Column(
        String, nullable=False, index=True
    )  # External connection ID
    organization_id = Column(Integer, ForeignKey("organizations.id"), nullable=False)
    provider = Column(String, nullable=False)
    created_by = Column(Integer, ForeignKey("users.id"))
    is_active = Column(Boolean, default=True, nullable=False)
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    connection_details = Column(JSON, nullable=False, default=dict)
    action = Column(String, nullable=False, default=IntegrationAction.ALL_CALLS.value)

    # Relationships
    organization = relationship("OrganizationModel", back_populates="integrations")


class WorkflowDefinitionModel(Base):
    __tablename__ = "workflow_definitions"
    id = Column(Integer, primary_key=True, index=True)
    workflow_hash = Column(String, nullable=True)  # Legacy, no longer used
    workflow_json = Column(JSON, nullable=False, default=dict)
    workflow_id = Column(Integer, ForeignKey("workflows.id"), nullable=True)
    is_current = Column(
        Boolean, default=False, nullable=False, server_default=text("false")
    )
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))

    # Versioning columns
    status = Column(
        String,
        nullable=False,
        default="published",
        server_default=text("'published'"),
    )  # draft | published | archived
    version_number = Column(
        Integer, nullable=True
    )  # Sequential per workflow, display only
    published_at = Column(DateTime(timezone=True), nullable=True)

    # Full behavioral snapshot (moved from WorkflowModel to enable versioning)
    workflow_configurations = Column(
        JSON, nullable=False, default=dict, server_default=text("'{}'::json")
    )
    template_context_variables = Column(
        JSON, nullable=False, default=dict, server_default=text("'{}'::json")
    )

    # Table constraints and indexes — unique hash constraint removed (no more dedup)
    __table_args__ = (
        Index("ix_workflow_definitions_workflow_status", "workflow_id", "status"),
    )

    # Relationships
    workflow = relationship(
        "WorkflowModel",
        back_populates="definitions",
        foreign_keys=[workflow_id],
    )
    workflow_runs = relationship("WorkflowRunModel", back_populates="definition")


class FolderModel(Base):
    """A folder for grouping workflows (agents) within an organization.

    Folders are flat (no nesting) and org-scoped. A workflow belongs to at
    most one folder via ``WorkflowModel.folder_id``; a NULL folder_id means
    the workflow is "Uncategorized".
    """

    __tablename__ = "folders"

    id = Column(Integer, primary_key=True, index=True)
    organization_id = Column(
        Integer, ForeignKey("organizations.id"), nullable=False, index=True
    )
    organization = relationship("OrganizationModel")
    name = Column(String, nullable=False)
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))

    workflows = relationship("WorkflowModel", back_populates="folder")

    # Folder names must be unique within an organization.
    __table_args__ = (
        UniqueConstraint("organization_id", "name", name="uq_folder_org_name"),
    )


class WorkflowModel(Base):
    __tablename__ = "workflows"
    id = Column(Integer, primary_key=True, index=True)
    workflow_uuid = Column(
        String(36),
        unique=True,
        nullable=False,
        index=True,
        default=lambda: str(uuid.uuid4()),
    )
    user_id = Column(Integer, ForeignKey("users.id"), nullable=True)
    user = relationship("UserModel", back_populates="workflows")
    organization_id = Column(Integer, ForeignKey("organizations.id"), nullable=True)
    organization = relationship("OrganizationModel")
    # Optional folder for grouping in the agents list. NULL = "Uncategorized".
    # ON DELETE SET NULL: deleting a folder un-files its agents, never deletes them.
    folder_id = Column(
        Integer,
        ForeignKey("folders.id", ondelete="SET NULL"),
        nullable=True,
        index=True,
    )
    folder = relationship("FolderModel", back_populates="workflows")
    name = Column(String, index=True, nullable=False)
    status = Column(
        Enum(*[status.value for status in WorkflowStatus], name="workflow_status"),
        nullable=False,
        default=WorkflowStatus.ACTIVE.value,
        server_default=text("'active'::workflow_status"),
    )
    workflow_definition = Column(JSON, nullable=False, default=dict)
    template_context_variables = Column(JSON, nullable=False, default=dict)
    call_disposition_codes = Column(JSON, nullable=False, default=dict)
    workflow_configurations = Column(
        JSON, nullable=False, default=dict, server_default=text("'{}'::json")
    )
    runs = relationship("WorkflowRunModel", back_populates="workflow")
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))

    # Pointer to the currently-live (published) version
    released_definition_id = Column(
        Integer,
        ForeignKey("workflow_definitions.id", use_alter=True),
        nullable=True,
    )
    released_definition = relationship(
        "WorkflowDefinitionModel",
        foreign_keys=[released_definition_id],
        uselist=False,
        viewonly=True,
    )

    # All versions / historical definitions of this workflow
    definitions = relationship(
        "WorkflowDefinitionModel",
        back_populates="workflow",
        foreign_keys="WorkflowDefinitionModel.workflow_id",
    )

    # Relationship to fetch the current (is_current=True) definition
    # Kept for backward compatibility during transition
    current_definition = relationship(
        "WorkflowDefinitionModel",
        primaryjoin=lambda: and_(
            WorkflowDefinitionModel.workflow_id == WorkflowModel.id,
            WorkflowDefinitionModel.is_current.is_(True),
        ),
        uselist=False,
        viewonly=True,
    )

    @property
    def current_definition_id(self):
        """Return ID of the current workflow definition (helper for backwards-compat)."""
        current_def = self.__dict__.get("current_definition")
        if current_def is not None:
            return current_def.id

        # If relationship is not loaded, we cannot safely access definitions without
        # risking an implicit lazy load on a detached instance. Return ``None`` in
        # that scenario so callers can handle the absence explicitly.
        return None


class WorkflowTemplates(Base):
    __tablename__ = "workflow_templates"
    id = Column(Integer, primary_key=True, index=True)
    template_name = Column(String, nullable=False, index=True)
    template_description = Column(String, nullable=False, index=True)
    template_json = Column(JSON, nullable=False, default=dict)
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))


class WorkflowRunModel(Base):
    __tablename__ = "workflow_runs"
    id = Column(Integer, primary_key=True, index=True)
    name = Column(String, nullable=False)
    workflow_id = Column(Integer, ForeignKey("workflows.id"), nullable=False)
    workflow = relationship("WorkflowModel", back_populates="runs")
    definition_id = Column(
        Integer, ForeignKey("workflow_definitions.id"), nullable=True
    )
    definition = relationship("WorkflowDefinitionModel", back_populates="workflow_runs")
    # Stored as VARCHAR (not a Postgres ENUM) so new telephony providers can
    # be added purely in application code without a database migration.
    # See WorkflowRunMode in api/enums.py for the canonical value set.
    mode = Column(String(64), nullable=False)
    call_type = Column(
        Enum(*[call_type.value for call_type in CallType], name="workflow_call_type"),
        nullable=False,
        default=CallType.OUTBOUND.value,
        server_default=text("'outbound'::workflow_call_type"),
    )
    state = Column(
        Enum(*[state.value for state in WorkflowRunState], name="workflow_run_state"),
        nullable=False,
        default=WorkflowRunState.INITIALIZED.value,
        server_default=text("'initialized'::workflow_run_state"),
    )
    is_completed = Column(Boolean, default=False)
    recording_url = Column(String, nullable=True)
    transcript_url = Column(String, nullable=True)
    extra = Column(
        JSON, nullable=False, default=dict, server_default=text("'{}'::json")
    )
    # Store storage backend as string enum (s3, minio)
    storage_backend = Column(
        Enum("s3", "minio", name="storage_backend"),
        nullable=False,
        default="s3",
        server_default=text("'s3'::storage_backend"),
    )
    usage_info = Column(JSON, nullable=False, default=dict)
    cost_info = Column(JSON, nullable=False, default=dict)
    initial_context = Column(JSON, nullable=False, default=dict)
    gathered_context = Column(JSON, nullable=False, default=dict)
    logs = Column(JSON, nullable=False, default=dict, server_default=text("'{}'::json"))
    annotations = Column(JSON, nullable=False, default=dict)
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    campaign_id = Column(Integer, ForeignKey("campaigns.id"), nullable=True)
    campaign = relationship("CampaignModel")
    queued_run_id = Column(Integer, ForeignKey("queued_runs.id"), nullable=True)
    queued_run = relationship("QueuedRunModel", foreign_keys=[queued_run_id])
    public_access_token = Column(String(36), nullable=True)
    text_session = relationship(
        "WorkflowRunTextSessionModel",
        back_populates="workflow_run",
        uselist=False,
        cascade="all, delete-orphan",
    )

    # Indexes
    __table_args__ = (
        Index(
            "idx_workflow_runs_public_access_token",
            "public_access_token",
            unique=True,
            postgresql_where=text("public_access_token IS NOT NULL"),
        ),
        Index(
            "idx_workflow_runs_call_id",
            text("(gathered_context->>'call_id')"),
            postgresql_where=text("gathered_context->>'call_id' IS NOT NULL"),
        ),
        Index("idx_workflow_runs_workflow_id", "workflow_id"),
        Index("idx_workflow_runs_campaign_id", "campaign_id"),
    )


class WorkflowRunTextSessionModel(Base):
    __tablename__ = "workflow_run_text_sessions"

    workflow_run_id = Column(
        Integer,
        ForeignKey("workflow_runs.id", ondelete="CASCADE"),
        primary_key=True,
    )
    workflow_run = relationship("WorkflowRunModel", back_populates="text_session")
    revision = Column(
        Integer,
        nullable=False,
        default=0,
        server_default=text("0"),
    )
    session_data = Column(
        JSON,
        nullable=False,
        default=dict,
        server_default=text("'{}'::json"),
    )
    checkpoint = Column(
        JSON,
        nullable=False,
        default=dict,
        server_default=text("'{}'::json"),
    )
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    updated_at = Column(
        DateTime(timezone=True),
        default=lambda: datetime.now(UTC),
        onupdate=lambda: datetime.now(UTC),
    )

    __table_args__ = (Index("ix_workflow_run_text_sessions_updated_at", "updated_at"),)


class OrganizationUsageCycleModel(Base):
    """
    This model is used to track reporting aggregates for an organization for a given
    usage cycle. Quota fields on this model are deprecated; MPS owns quota and
    credit ledger state.
    """

    __tablename__ = "organization_usage_cycles"

    id = Column(Integer, primary_key=True, index=True)
    organization_id = Column(Integer, ForeignKey("organizations.id"), nullable=False)
    period_start = Column(DateTime(timezone=True), nullable=False)
    period_end = Column(DateTime(timezone=True), nullable=False)
    quota_dograh_tokens = Column(
        Integer,
        nullable=False,
        comment="Deprecated. MPS owns quota and credit ledger state.",
        info={"deprecated": True},
    )
    used_dograh_tokens = Column(Float, nullable=False, default=0)
    total_duration_seconds = Column(
        Integer, nullable=False, default=0, server_default=text("0")
    )
    # New USD tracking fields
    used_amount_usd = Column(Float, nullable=True, default=0)
    quota_amount_usd = Column(
        Float,
        nullable=True,
        comment="Deprecated. MPS owns quota and credit ledger state.",
        info={"deprecated": True},
    )
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    updated_at = Column(
        DateTime(timezone=True),
        default=lambda: datetime.now(UTC),
        onupdate=lambda: datetime.now(UTC),
    )

    # Relationships
    organization = relationship("OrganizationModel", back_populates="usage_cycles")

    # Constraints and indexes
    __table_args__ = (
        UniqueConstraint(
            "organization_id", "period_start", "period_end", name="unique_org_period"
        ),
        Index("idx_usage_cycles_org_period", "organization_id", "period_end"),
    )


class CampaignModel(Base):
    __tablename__ = "campaigns"

    id = Column(Integer, primary_key=True, index=True)
    name = Column(String, nullable=False, index=True)
    organization_id = Column(Integer, ForeignKey("organizations.id"), nullable=False)
    workflow_id = Column(Integer, ForeignKey("workflows.id"), nullable=False)
    created_by = Column(Integer, ForeignKey("users.id"), nullable=False)
    # Nullable during the legacy → multi-config migration window. Backfilled to the
    # org's default config by the migration; will become NOT NULL in a follow-up.
    telephony_configuration_id = Column(
        Integer, ForeignKey("telephony_configurations.id"), nullable=True
    )

    # Source configuration
    source_type = Column(String, nullable=False, default="csv")
    source_id = Column(String, nullable=False)  # CSV file key

    # State management
    state = Column(
        Enum(
            "created",
            "syncing",
            "running",
            "paused",
            "completed",
            "failed",
            name="campaign_state",
        ),
        nullable=False,
        default="created",
    )

    # Progress tracking
    total_rows = Column(Integer, nullable=True)
    processed_rows = Column(Integer, nullable=False, default=0)
    failed_rows = Column(Integer, nullable=False, default=0)

    # Rate limiting and sync configuration
    rate_limit_per_second = Column(Integer, nullable=False, default=1)
    max_retries = Column(Integer, nullable=False, default=0)
    source_sync_status = Column(String, nullable=False, default="pending")
    source_last_synced_at = Column(DateTime(timezone=True), nullable=True)
    source_sync_error = Column(String, nullable=True)

    # Retry configuration for call failures
    retry_config = Column(
        JSON,
        nullable=False,
        default=DEFAULT_CAMPAIGN_RETRY_CONFIG,
        server_default=text(
            '\'{"enabled": true, "max_retries": 2, "retry_on_busy": true, "retry_on_no_answer": true, "retry_on_voicemail": true, "retry_delay_seconds": 120}\'::jsonb'
        ),
    )

    # Orchestrator tracking fields
    last_batch_scheduled_at = Column(DateTime(timezone=True), nullable=True)
    last_activity_at = Column(DateTime(timezone=True), nullable=True)
    orchestrator_metadata = Column(
        JSON, nullable=False, default=dict, server_default=text("'{}'::json")
    )

    # Append-only timestamped log entries for state transitions, failures,
    # and circuit-breaker events. Surfaced in the UI so operators can see
    # why a campaign moved to paused/failed without digging through logs.
    logs = Column(
        JSON,
        nullable=False,
        default=list,
        server_default=text("'[]'::json"),
    )

    # Timestamps
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    started_at = Column(DateTime(timezone=True), nullable=True)
    completed_at = Column(DateTime(timezone=True), nullable=True)
    updated_at = Column(
        DateTime(timezone=True),
        default=lambda: datetime.now(UTC),
        onupdate=lambda: datetime.now(UTC),
    )

    # Relationships
    organization = relationship("OrganizationModel")
    workflow = relationship("WorkflowModel")
    created_by_user = relationship("UserModel")

    # Indexes
    __table_args__ = (
        Index("ix_campaigns_org_id", "organization_id"),
        Index("ix_campaigns_state", "state"),
        Index("ix_campaigns_workflow_id", "workflow_id"),
        Index(
            "ix_campaigns_telephony_config",
            "telephony_configuration_id",
            postgresql_where=text("telephony_configuration_id IS NOT NULL"),
        ),
        # Index for efficient querying of active campaigns
        Index(
            "idx_campaigns_active_status",
            "state",
            postgresql_where=text("state IN ('syncing', 'running', 'paused')"),
        ),
    )


class QueuedRunModel(Base):
    __tablename__ = "queued_runs"

    id = Column(Integer, primary_key=True, index=True)
    campaign_id = Column(
        Integer, ForeignKey("campaigns.id", ondelete="CASCADE"), nullable=False
    )
    source_uuid = Column(String, nullable=False)
    context_variables = Column(JSON, nullable=False, default=dict)
    state = Column(
        Enum("queued", "processed", "processing", "failed", name="queued_run_state"),
        nullable=False,
        default="queued",
    )
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    processed_at = Column(DateTime(timezone=True), nullable=True)

    # New retry-related fields
    retry_count = Column(Integer, default=0, nullable=False, server_default=text("0"))
    parent_queued_run_id = Column(Integer, ForeignKey("queued_runs.id"), nullable=True)
    scheduled_for = Column(DateTime(timezone=True), nullable=True)
    retry_reason = Column(String, nullable=True)  # 'busy', 'no_answer', 'voicemail'

    # Relationships
    campaign = relationship("CampaignModel")
    parent_queued_run = relationship("QueuedRunModel", remote_side=[id])

    # Indexes
    __table_args__ = (
        Index("idx_queued_runs_campaign_state", "campaign_id", "state"),
        Index("idx_queued_runs_created", "created_at"),
        Index("idx_queued_runs_source_uuid", "source_uuid"),
        Index(
            "idx_queued_runs_scheduled", "scheduled_for"
        ),  # New index for scheduled retries
        # Optimized index for checking queued runs efficiently
        Index(
            "idx_queued_runs_campaign_state_optimized",
            "campaign_id",
            "state",
            postgresql_where=text("state = 'queued'"),
        ),
        # Optimized index for scheduled retries
        Index(
            "idx_queued_runs_scheduled_optimized",
            "campaign_id",
            "scheduled_for",
            postgresql_where=text("scheduled_for IS NOT NULL"),
        ),
        UniqueConstraint(
            "campaign_id",
            "source_uuid",
            "retry_count",
            name="unique_campaign_source_retry",
        ),
    )


class EmbedTokenModel(Base):
    """Model for storing workflow embed tokens"""

    __tablename__ = "embed_tokens"

    id = Column(Integer, primary_key=True, index=True)
    token = Column(String(255), unique=True, nullable=False, index=True)
    workflow_id = Column(
        Integer,
        ForeignKey("workflows.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    organization_id = Column(
        Integer,
        ForeignKey("organizations.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    allowed_domains = Column(JSON, nullable=True)  # Array of whitelisted domains
    settings = Column(JSON, nullable=True)  # Widget customization settings
    is_active = Column(Boolean, default=True, nullable=False, index=True)
    usage_limit = Column(Integer, nullable=True)  # Optional usage limit
    usage_count = Column(Integer, default=0, nullable=False)
    expires_at = Column(DateTime(timezone=True), nullable=True)
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    created_by = Column(
        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False
    )
    updated_at = Column(DateTime(timezone=True), nullable=True)

    # Relationships
    workflow = relationship("WorkflowModel")
    organization = relationship("OrganizationModel")
    creator = relationship("UserModel")
    sessions = relationship(
        "EmbedSessionModel", back_populates="embed_token", cascade="all, delete-orphan"
    )


class EmbedSessionModel(Base):
    """Model for storing temporary embed sessions"""

    __tablename__ = "embed_sessions"

    id = Column(Integer, primary_key=True, index=True)
    session_token = Column(String(255), unique=True, nullable=False, index=True)
    embed_token_id = Column(
        Integer, ForeignKey("embed_tokens.id", ondelete="CASCADE"), nullable=False
    )
    workflow_run_id = Column(
        Integer, ForeignKey("workflow_runs.id", ondelete="CASCADE"), nullable=True
    )
    client_ip = Column(String(45), nullable=True)
    user_agent = Column(String(500), nullable=True)
    origin = Column(String(255), nullable=True)
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    expires_at = Column(DateTime(timezone=True), nullable=False, index=True)

    # Relationships
    embed_token = relationship("EmbedTokenModel", back_populates="sessions")
    workflow_run = relationship("WorkflowRunModel")


class AgentTriggerModel(Base):
    """Model for storing agent trigger mappings (UUID -> workflow_id).

    This is a minimal lookup table that maps trigger UUIDs to workflows.
    The trigger node in the workflow definition is the source of truth.
    """

    __tablename__ = "agent_triggers"

    id = Column(Integer, primary_key=True, index=True)

    # Globally unique trigger path (UUID format)
    trigger_path = Column(String(36), unique=True, nullable=False, index=True)

    # Link to workflow
    workflow_id = Column(
        Integer, ForeignKey("workflows.id", ondelete="CASCADE"), nullable=False
    )
    organization_id = Column(
        Integer, ForeignKey("organizations.id", ondelete="CASCADE"), nullable=False
    )

    # State management (active/archived)
    state = Column(
        Enum(*[state.value for state in TriggerState], name="trigger_state"),
        nullable=False,
        default=TriggerState.ACTIVE.value,
        server_default=text("'active'::trigger_state"),
    )

    # Audit
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))

    # Relationships
    workflow = relationship("WorkflowModel")
    organization = relationship("OrganizationModel")

    # Indexes for performance
    __table_args__ = (
        Index("ix_agent_triggers_workflow_id", "workflow_id"),
        Index("ix_agent_triggers_state", "state"),
    )


class ExternalCredentialModel(Base):
    """Model for storing external authentication credentials.

    Credentials are stored separately from webhook configurations to allow
    reuse across multiple workflows and secure storage of sensitive data.
    """

    __tablename__ = "external_credentials"

    id = Column(Integer, primary_key=True, index=True)

    # Public UUID reference (used in APIs and workflow definitions)
    # This prevents enumeration attacks and hides internal IDs
    credential_uuid = Column(
        String(36),
        unique=True,
        nullable=False,
        index=True,
        default=lambda: str(uuid.uuid4()),
    )

    # Organization scoping
    organization_id = Column(
        Integer, ForeignKey("organizations.id", ondelete="CASCADE"), nullable=False
    )

    # Credential metadata
    name = Column(String, nullable=False)  # Display name, e.g., "Salesforce API"
    description = Column(String, nullable=True)  # Optional description

    # Credential type - uses enum from api/enums.py
    credential_type = Column(
        Enum(
            *[t.value for t in WebhookCredentialType],
            name="webhook_credential_type",
        ),
        nullable=False,
        default=WebhookCredentialType.NONE.value,
    )

    # Encrypted credential data (JSON)
    # Structure depends on credential_type:
    # - api_key: {"header_name": "X-API-Key", "api_key": "value"}
    # - bearer_token: {"token": "value"}
    # - basic_auth: {"username": "user", "password": "value"}
    # - custom_header: {"header_name": "X-Custom", "header_value": "value"}
    credential_data = Column(JSON, nullable=False, default=dict)

    # Audit fields
    created_by = Column(Integer, ForeignKey("users.id"), nullable=False)
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    updated_at = Column(
        DateTime(timezone=True),
        default=lambda: datetime.now(UTC),
        onupdate=lambda: datetime.now(UTC),
    )

    # Soft delete for safety
    is_active = Column(Boolean, default=True, nullable=False)

    # Relationships
    organization = relationship("OrganizationModel")
    created_by_user = relationship("UserModel")

    # Indexes and constraints
    __table_args__ = (
        Index("ix_webhook_credentials_organization_id", "organization_id"),
        Index("ix_webhook_credentials_uuid", "credential_uuid"),
        UniqueConstraint("organization_id", "name", name="unique_org_credential_name"),
    )


class WebhookDeliveryModel(Base):
    """Durable record of an outbound webhook delivery attempt.

    Final webhooks (e.g. a workflow's "Final Webhook" node) must not be lost to a
    single transient network error. Instead of firing the HTTP request inline and
    forgetting it, we persist one row per webhook node per workflow run and let an
    ARQ task drive delivery with bounded, backed-off retries. The row is the source
    of truth: it survives worker restarts and a periodic sweeper re-enqueues any
    ``pending`` delivery whose ``scheduled_for`` is overdue. After ``max_attempts``
    transient failures (or on a permanent 4xx) the row is parked as ``dead_letter``
    for inspection rather than retried forever.

    Mirrors the campaign retry pattern (``QueuedRunModel``): persisted state,
    ``scheduled_for`` gating, a hard attempt ceiling, and a terminal failure state.
    """

    __tablename__ = "webhook_deliveries"

    id = Column(Integer, primary_key=True, index=True)

    # Stable idempotency key sent to the receiver so it can dedupe retries.
    delivery_uuid = Column(
        String(36),
        unique=True,
        nullable=False,
        index=True,
        default=lambda: str(uuid.uuid4()),
    )

    workflow_run_id = Column(
        Integer,
        ForeignKey("workflow_runs.id", ondelete="CASCADE"),
        nullable=False,
    )
    organization_id = Column(
        Integer, ForeignKey("organizations.id", ondelete="CASCADE"), nullable=False
    )

    # Frozen request definition. The payload is rendered once at enqueue time so
    # retries are deterministic. Secrets are NOT stored here: the auth header is
    # re-resolved from ``credential_uuid`` at send time (honours rotation/revocation).
    webhook_name = Column(String, nullable=True)
    endpoint_url = Column(String, nullable=False)
    http_method = Column(String, nullable=False, default="POST")
    payload = Column(JSON, nullable=False, default=dict)
    custom_headers = Column(JSON, nullable=True)
    credential_uuid = Column(String(36), nullable=True)

    # Workflow node that produced this delivery. Combined with workflow_run_id it
    # is the per-run/per-node idempotency key, so a retried run_integrations does
    # not create (and send) a duplicate delivery for the same node. Non-nullable:
    # a NULL would be distinct under the unique constraint and defeat the dedupe.
    webhook_node_id = Column(String, nullable=False)

    status = Column(
        Enum(
            "pending",
            "succeeded",
            "dead_letter",
            name="webhook_delivery_status",
        ),
        nullable=False,
        default="pending",
        server_default="pending",
    )
    attempt_count = Column(Integer, nullable=False, default=0, server_default=text("0"))
    max_attempts = Column(Integer, nullable=False, default=5, server_default=text("5"))
    # When the next attempt becomes due. NULL once terminal (succeeded/dead_letter).
    scheduled_for = Column(DateTime(timezone=True), nullable=True)

    last_status_code = Column(Integer, nullable=True)
    last_error = Column(Text, nullable=True)

    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    updated_at = Column(
        DateTime(timezone=True),
        default=lambda: datetime.now(UTC),
        onupdate=lambda: datetime.now(UTC),
    )

    __table_args__ = (
        # Sweeper lookup: due pending deliveries.
        Index(
            "idx_webhook_deliveries_pending_scheduled",
            "scheduled_for",
            postgresql_where=text("status = 'pending'"),
        ),
        Index("idx_webhook_deliveries_run", "workflow_run_id"),
        # Per-run/per-node idempotency: one delivery per webhook node per run.
        UniqueConstraint(
            "workflow_run_id",
            "webhook_node_id",
            name="uq_webhook_deliveries_run_node",
        ),
    )


class ToolModel(Base):
    """Model for storing reusable tools that can be invoked during workflows.

    Tools provide a standardized way to integrate external functionality - from
    HTTP API calls to native integrations.
    """

    __tablename__ = "tools"

    id = Column(Integer, primary_key=True, index=True)

    # Public identifier (used in APIs and workflow references)
    tool_uuid = Column(
        String(36),
        unique=True,
        nullable=False,
        index=True,
        default=lambda: str(uuid.uuid4()),
    )

    # Organization scoping
    organization_id = Column(
        Integer, ForeignKey("organizations.id", ondelete="CASCADE"), nullable=False
    )

    # Tool metadata
    name = Column(String(255), nullable=False)
    description = Column(String, nullable=True)

    # Tool category - uses enum from api/enums.py
    category = Column(
        Enum(
            *[c.value for c in ToolCategory],
            name="tool_category",
        ),
        nullable=False,
        default=ToolCategory.HTTP_API.value,
    )

    # Icon configuration (for UI display)
    icon = Column(String(50), nullable=True)  # Icon identifier
    icon_color = Column(String(7), nullable=True)  # Hex color code

    # Status management
    status = Column(
        Enum(
            *[s.value for s in ToolStatus],
            name="tool_status",
        ),
        nullable=False,
        default=ToolStatus.ACTIVE.value,
        server_default=text("'active'::tool_status"),
    )

    # The tool definition (JSONB) - contains schema_version for compatibility
    # Structure depends on category:
    # - http_api: {"schema_version": 1, "type": "http_api", "config": {...}}
    definition = Column(JSON, nullable=False, default=dict)

    # Audit fields
    created_by = Column(Integer, ForeignKey("users.id"), nullable=False)
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    updated_at = Column(
        DateTime(timezone=True),
        default=lambda: datetime.now(UTC),
        onupdate=lambda: datetime.now(UTC),
    )

    # Relationships
    organization = relationship("OrganizationModel")
    created_by_user = relationship("UserModel")

    # Indexes and constraints
    __table_args__ = (
        Index("ix_tools_organization_id", "organization_id"),
        Index("ix_tools_uuid", "tool_uuid"),
        Index("ix_tools_status", "status"),
        Index("ix_tools_category", "category"),
    )


class KnowledgeBaseDocumentModel(Base):
    """Model for storing document-level metadata in the knowledge base.

    Each document represents a source file (PDF, DOCX, etc.) that has been
    processed and chunked for retrieval.
    """

    __tablename__ = "knowledge_base_documents"

    id = Column(Integer, primary_key=True, index=True)

    # Public identifier for API references
    document_uuid = Column(
        String(36),
        unique=True,
        nullable=False,
        index=True,
        default=lambda: str(uuid.uuid4()),
    )

    # Organization scoping
    organization_id = Column(
        Integer, ForeignKey("organizations.id", ondelete="CASCADE"), nullable=False
    )

    # Document metadata
    filename = Column(String(500), nullable=False)
    file_size_bytes = Column(Integer, nullable=True)
    file_hash = Column(String(64), nullable=True)  # SHA-256 hash for deduplication
    mime_type = Column(String(100), nullable=True)

    # Retrieval mode: "chunked" (vector search) or "full_document" (return full text)
    retrieval_mode = Column(
        String(20), nullable=False, default="chunked", server_default="chunked"
    )
    full_text = Column(
        Text, nullable=True
    )  # Stored when retrieval_mode is "full_document"

    # Processing metadata
    source_url = Column(String, nullable=True)  # If document was fetched from URL
    total_chunks = Column(Integer, nullable=False, default=0)
    processing_status = Column(
        Enum(
            "pending",
            "processing",
            "completed",
            "failed",
            name="document_processing_status",
        ),
        nullable=False,
        default="pending",
        server_default=text("'pending'::document_processing_status"),
    )
    processing_error = Column(Text, nullable=True)

    # Docling conversion metadata
    docling_metadata = Column(
        JSON, nullable=False, default=dict
    )  # Store docling document metadata

    # Custom metadata (user-defined tags, categories, etc.)
    custom_metadata = Column(JSON, nullable=False, default=dict)

    # Audit fields
    created_by = Column(Integer, ForeignKey("users.id"), nullable=False)
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    updated_at = Column(
        DateTime(timezone=True),
        default=lambda: datetime.now(UTC),
        onupdate=lambda: datetime.now(UTC),
    )

    # Soft delete
    is_active = Column(Boolean, default=True, nullable=False)
    archived_at = Column(DateTime(timezone=True), nullable=True)

    # Relationships
    organization = relationship("OrganizationModel")
    created_by_user = relationship("UserModel")
    chunks = relationship(
        "KnowledgeBaseChunkModel",
        back_populates="document",
        cascade="all, delete-orphan",
    )

    # Indexes and constraints
    __table_args__ = (
        Index("ix_kb_documents_organization_id", "organization_id"),
        Index("ix_kb_documents_uuid", "document_uuid"),
        Index("ix_kb_documents_status", "processing_status"),
        Index("ix_kb_documents_created_at", "created_at"),
    )


class WorkflowRecordingModel(Base):
    """Model for storing audio recordings scoped to an organization.

    Recordings are used in hybrid prompts where parts of the output are pre-recorded
    audio rather than dynamically generated TTS.
    """

    __tablename__ = "workflow_recordings"

    id = Column(Integer, primary_key=True, index=True)

    # Descriptive ID used in prompts (unique per organization)
    recording_id = Column(String(64), nullable=False, index=True)

    # Scoping
    workflow_id = Column(
        Integer, ForeignKey("workflows.id", ondelete="CASCADE"), nullable=True
    )
    organization_id = Column(
        Integer, ForeignKey("organizations.id", ondelete="CASCADE"), nullable=False
    )

    # TTS configuration metadata (optional, legacy)
    tts_provider = Column(String, nullable=True)
    tts_model = Column(String, nullable=True)
    tts_voice_id = Column(String, nullable=True)

    # Content
    transcript = Column(Text, nullable=False)

    # Storage
    storage_key = Column(String, nullable=False)
    storage_backend = Column(
        Enum("s3", "minio", name="recording_storage_backend"),
        nullable=False,
        default="s3",
        server_default=text("'s3'::recording_storage_backend"),
    )

    # Extra metadata (file_size_bytes, duration_seconds, original_filename, mime_type, etc.)
    recording_metadata = Column(
        JSON, nullable=False, default=dict, server_default=text("'{}'::json")
    )

    # Audit
    created_by = Column(Integer, ForeignKey("users.id"), nullable=False)
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))

    # Soft delete
    is_active = Column(Boolean, default=True, nullable=False)

    # Relationships
    workflow = relationship("WorkflowModel")
    organization = relationship("OrganizationModel")
    created_by_user = relationship("UserModel")

    # Indexes
    __table_args__ = (
        UniqueConstraint(
            "recording_id",
            "organization_id",
            name="uq_workflow_recordings_recording_id_org",
        ),
        Index("ix_workflow_recordings_workflow_id", "workflow_id"),
        Index("ix_workflow_recordings_org_id", "organization_id"),
        Index("ix_workflow_recordings_recording_id", "recording_id"),
    )


class KnowledgeBaseChunkModel(Base):
    """Model for storing document chunks with vector embeddings.

    Each chunk represents a portion of a document that has been:
    1. Extracted and chunked by docling's HybridChunker
    2. Optionally contextualized with surrounding information
    3. Embedded into a vector representation for semantic search
    """

    __tablename__ = "knowledge_base_chunks"

    id = Column(Integer, primary_key=True, index=True)

    # Link to parent document
    document_id = Column(
        Integer,
        ForeignKey("knowledge_base_documents.id", ondelete="CASCADE"),
        nullable=False,
    )

    # Organization scoping (denormalized for efficient querying)
    organization_id = Column(
        Integer, ForeignKey("organizations.id", ondelete="CASCADE"), nullable=False
    )

    # Chunk content
    chunk_text = Column(Text, nullable=False)  # The actual chunk text
    contextualized_text = Column(
        Text, nullable=True
    )  # Enriched text from chunker.contextualize()

    # Chunk positioning and metadata
    chunk_index = Column(Integer, nullable=False)  # Position in document (0-based)

    # Docling chunk metadata
    chunk_metadata = Column(
        JSON, nullable=False, default=dict
    )  # Store chunk.meta if available

    # Embedding configuration
    embedding_model = Column(
        String(200), nullable=False
    )  # e.g., "sentence-transformers/all-MiniLM-L6-v2"
    embedding_dimension = Column(
        Integer, nullable=False
    )  # e.g., 384 for all-MiniLM-L6-v2

    # Vector embedding (pgvector column)
    # The dimension should match the embedding_dimension field
    # Default: 1536 dimensions for OpenAI text-embedding-3-small
    # SentenceTransformer (384-dim) also supported but stored as 384-dim vectors
    embedding = Column(Vector(1536), nullable=True)

    # Token count (useful for chunking strategy analysis)
    token_count = Column(Integer, nullable=True)

    # Timestamps
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(UTC))
    updated_at = Column(
        DateTime(timezone=True),
        default=lambda: datetime.now(UTC),
        onupdate=lambda: datetime.now(UTC),
    )

    # Relationships
    document = relationship("KnowledgeBaseDocumentModel", back_populates="chunks")
    organization = relationship("OrganizationModel")

    # Indexes and constraints
    __table_args__ = (
        Index("ix_kb_chunks_document_id", "document_id"),
        Index("ix_kb_chunks_organization_id", "organization_id"),
        Index("ix_kb_chunks_chunk_index", "chunk_index"),
        Index(
            "ix_kb_chunks_embedding_model", "embedding_model"
        ),  # For filtering by model
        # Vector similarity search index (using IVFFlat or HNSW)
        # IVFFlat is good for datasets with 10k-1M vectors
        # HNSW is better for larger datasets but uses more memory
        Index(
            "ix_kb_chunks_embedding_ivfflat",
            "embedding",
            postgresql_using="ivfflat",
            postgresql_with={"lists": 100},  # Adjust based on dataset size
            postgresql_ops={"embedding": "vector_cosine_ops"},
        ),
    )