setting up bluesky firehose

overlays/default.nix

@@ -21,6 +21,7 @@
         alembic
         apprise
         apscheduler
+        confluent-kafka
         fastapi
         fastapi-cli
         httpx

python/data_science/bluesky_ids.py

@@ -0,0 +1,104 @@
+"""Utilities for converting Bluesky identifiers to numeric database IDs.
+
+Handles DID-to-user_id hashing, TID-to-post_id decoding, and AT-URI parsing.
+"""
+
+from __future__ import annotations
+
+import hashlib
+
+TID_CHARSET = "234567abcdefghijklmnopqrstuvwxyz"
+_TID_LENGTH = 13
+_BIGINT_MASK = 0x7FFFFFFFFFFFFFFF
+_AT_URI_SEGMENT_COUNT = 3
+
+
+def did_to_user_id(did: str) -> int:
+    """Convert a DID string to a deterministic 63-bit integer for user_id.
+
+    Uses SHA-256, truncated to 63 bits (positive signed BigInteger range).
+    Collision probability is negligible at Bluesky's scale (~tens of millions of users).
+
+    Args:
+        did: A Bluesky DID string, e.g. "did:plc:abc123".
+
+    Returns:
+        A positive 63-bit integer suitable for BigInteger storage.
+    """
+    digest = hashlib.sha256(did.encode()).digest()
+    return int.from_bytes(digest[:8], "big") & _BIGINT_MASK
+
+
+def tid_to_integer(tid: str) -> int:
+    """Decode a Bluesky TID (base32-sortbase) into a 64-bit integer for post_id.
+
+    TIDs are 13-character, base32-sortbase encoded identifiers that encode a
+    microsecond timestamp plus a clock ID. They are globally unique by construction.
+
+    Args:
+        tid: A 13-character TID string, e.g. "3abc2defghijk".
+
+    Returns:
+        A positive integer suitable for BigInteger storage.
+
+    Raises:
+        ValueError: If the TID is malformed (wrong length or invalid characters).
+    """
+    if len(tid) != _TID_LENGTH:
+        message = f"TID must be {_TID_LENGTH} characters, got {len(tid)}: {tid!r}"
+        raise ValueError(message)
+
+    result = 0
+    for char in tid:
+        index = TID_CHARSET.find(char)
+        if index == -1:
+            message = f"Invalid character {char!r} in TID {tid!r}"
+            raise ValueError(message)
+        result = result * 32 + index
+    return result
+
+
+def parse_at_uri(uri: str) -> tuple[str, str, str]:
+    """Parse an AT-URI into its components.
+
+    Args:
+        uri: An AT-URI string, e.g. "at://did:plc:abc123/app.bsky.feed.post/3abc2defghijk".
+
+    Returns:
+        A tuple of (did, collection, rkey).
+
+    Raises:
+        ValueError: If the URI doesn't have the expected format.
+    """
+    stripped = uri.removeprefix("at://")
+    parts = stripped.split("/", maxsplit=2)
+    if len(parts) != _AT_URI_SEGMENT_COUNT:
+        message = f"Expected {_AT_URI_SEGMENT_COUNT} path segments in AT-URI, got {len(parts)}: {uri!r}"
+        raise ValueError(message)
+    return parts[0], parts[1], parts[2]
+
+
+def post_id_from_uri(uri: str) -> int:
+    """Extract and decode the post_id (TID) from an AT-URI.
+
+    Args:
+        uri: An AT-URI pointing to a post.
+
+    Returns:
+        The post_id as an integer.
+    """
+    _did, _collection, rkey = parse_at_uri(uri)
+    return tid_to_integer(rkey)
+
+
+def user_id_from_uri(uri: str) -> int:
+    """Extract and hash the user_id (DID) from an AT-URI.
+
+    Args:
+        uri: An AT-URI pointing to a post.
+
+    Returns:
+        The user_id as an integer.
+    """
+    did, _collection, _rkey = parse_at_uri(uri)
+    return did_to_user_id(did)

python/data_science/bluesky_transform.py

@@ -0,0 +1,143 @@
+"""Transform Bluesky Jetstream messages into rows matching the Posts table schema."""
+
+from __future__ import annotations
+
+import json
+import logging
+from datetime import datetime
+
+from python.data_science.bluesky_ids import (
+    did_to_user_id,
+    post_id_from_uri,
+    tid_to_integer,
+    user_id_from_uri,
+)
+
+logger = logging.getLogger(__name__)
+
+INSTANCE = "bsky"
+POST_COLLECTION = "app.bsky.feed.post"
+EMBED_RECORD_TYPE = "app.bsky.embed.record"
+EMBED_RECORD_WITH_MEDIA_TYPE = "app.bsky.embed.recordWithMedia"
+
+
+def transform_jetstream_post(message: dict) -> dict:
+    """Transform a Jetstream commit message into a dict matching Posts table columns.
+
+    Expects a Jetstream message with kind=commit, operation=create,
+    collection=app.bsky.feed.post.
+
+    Args:
+        message: The full Jetstream JSON message.
+
+    Returns:
+        A dict with keys matching the Posts table columns.
+    """
+    did = message["did"]
+    commit = message["commit"]
+    record = commit["record"]
+
+    row: dict = {
+        "post_id": tid_to_integer(commit["rkey"]),
+        "user_id": did_to_user_id(did),
+        "instance": INSTANCE,
+        "date": datetime.fromisoformat(record["createdAt"]),
+        "text": record.get("text", ""),
+        "langs": _extract_langs(record),
+        "like_count": 0,
+        "reply_count": 0,
+        "repost_count": 0,
+        "reply_to": None,
+        "replied_author": None,
+        "thread_root": None,
+        "thread_root_author": None,
+        "repost_from": None,
+        "reposted_author": None,
+        "quotes": None,
+        "quoted_author": None,
+        "labels": _extract_labels(record),
+        "sent_label": None,
+        "sent_score": None,
+    }
+
+    _extract_reply_refs(record, row)
+    _extract_quote_refs(record, row)
+
+    return row
+
+
+def is_post_create(message: dict) -> bool:
+    """Check if a Jetstream message is a post creation event.
+
+    Args:
+        message: The full Jetstream JSON message.
+
+    Returns:
+        True if this is a create commit for app.bsky.feed.post.
+    """
+    if message.get("kind") != "commit":
+        return False
+    commit = message.get("commit", {})
+    return commit.get("operation") == "create" and commit.get("collection") == POST_COLLECTION
+
+
+def _extract_langs(record: dict) -> str | None:
+    """Extract langs array as a JSON string, or None if absent."""
+    langs = record.get("langs")
+    if langs is None:
+        return None
+    return json.dumps(langs)
+
+
+def _extract_labels(record: dict) -> str | None:
+    """Extract self-labels as a JSON string, or None if absent."""
+    labels_obj = record.get("labels")
+    if labels_obj is None:
+        return None
+    values = labels_obj.get("values", [])
+    if not values:
+        return None
+    label_strings = [label.get("val", "") for label in values]
+    return json.dumps(label_strings)
+
+
+def _extract_reply_refs(record: dict, row: dict) -> None:
+    """Populate reply_to, replied_author, thread_root, thread_root_author from record.reply."""
+    reply = record.get("reply")
+    if reply is None:
+        return
+
+    parent = reply.get("parent", {})
+    parent_uri = parent.get("uri")
+    if parent_uri:
+        row["reply_to"] = post_id_from_uri(parent_uri)
+        row["replied_author"] = user_id_from_uri(parent_uri)
+
+    root = reply.get("root", {})
+    root_uri = root.get("uri")
+    if root_uri:
+        row["thread_root"] = post_id_from_uri(root_uri)
+        row["thread_root_author"] = user_id_from_uri(root_uri)
+
+
+def _extract_quote_refs(record: dict, row: dict) -> None:
+    """Populate quotes and quoted_author from embed record references."""
+    embed = record.get("embed")
+    if embed is None:
+        return
+
+    embed_type = embed.get("$type", "")
+
+    if embed_type == EMBED_RECORD_TYPE:
+        _set_quote_from_record(embed.get("record", {}), row)
+    elif embed_type == EMBED_RECORD_WITH_MEDIA_TYPE:
+        inner_record = embed.get("record", {}).get("record", {})
+        _set_quote_from_record(inner_record, row)
+
+
+def _set_quote_from_record(record_ref: dict, row: dict) -> None:
+    """Set quotes and quoted_author from a record reference object."""
+    uri = record_ref.get("uri")
+    if uri and POST_COLLECTION in uri:
+        row["quotes"] = post_id_from_uri(uri)
+        row["quoted_author"] = user_id_from_uri(uri)

python/data_science/firehose_consumer.py

@@ -0,0 +1,203 @@
+"""Kafka consumer that ingests Bluesky posts into the partitioned Posts table.
+
+Consumes Jetstream messages from Kafka, transforms them into Posts rows,
+and batch-inserts them into PostgreSQL with manual offset commits.
+
+Usage:
+    firehose-consumer
+    firehose-consumer --kafka-servers kafka:9092 --batch-size 500
+"""
+
+from __future__ import annotations
+
+import json
+import logging
+import signal
+from os import getenv
+from threading import Event
+from typing import Annotated
+
+import typer
+from confluent_kafka import Consumer, KafkaError, KafkaException
+from sqlalchemy.orm import Session
+
+from python.data_science.bluesky_transform import is_post_create, transform_jetstream_post
+from python.data_science.ingest_posts import ingest_batch
+from python.orm.common import get_postgres_engine
+from python.orm.data_science_dev.posts.failed_ingestion import FailedIngestion
+
+logger = logging.getLogger(__name__)
+
+DEFAULT_TOPIC = "bluesky.firehose.posts"
+DEFAULT_KAFKA_SERVERS = "localhost:9092"
+DEFAULT_GROUP_ID = "bluesky-posts-ingestor"
+DEFAULT_BATCH_SIZE = 500
+POLL_TIMEOUT_SECONDS = 5.0
+
+shutdown_event = Event()
+
+app = typer.Typer(help="Consume Bluesky posts from Kafka and ingest into PostgreSQL.")
+
+
+@app.command()
+def main(
+    kafka_servers: Annotated[str, typer.Option(help="Kafka bootstrap servers")] = "",
+    topic: Annotated[str, typer.Option(help="Kafka topic to consume from")] = "",
+    group_id: Annotated[str, typer.Option(help="Kafka consumer group ID")] = "",
+    batch_size: Annotated[int, typer.Option(help="Messages per DB insert batch")] = DEFAULT_BATCH_SIZE,
+) -> None:
+    """Consume Bluesky posts from Kafka and ingest into the partitioned posts table."""
+    logging.basicConfig(
+        level=logging.INFO,
+        format="%(asctime)s %(levelname)s %(message)s",
+        datefmt="%H:%M:%S",
+    )
+
+    servers = kafka_servers or getenv("KAFKA_BOOTSTRAP_SERVERS", DEFAULT_KAFKA_SERVERS)
+    topic_name = topic or getenv("BLUESKY_FIREHOSE_TOPIC", DEFAULT_TOPIC)
+    group = group_id or getenv("KAFKA_GROUP_ID", DEFAULT_GROUP_ID)
+
+    signal.signal(signal.SIGTERM, _handle_shutdown)
+    signal.signal(signal.SIGINT, _handle_shutdown)
+
+    consumer = _create_consumer(servers, group)
+    consumer.subscribe([topic_name])
+
+    engine = get_postgres_engine(name="DATA_SCIENCE_DEV")
+    total_inserted = 0
+
+    logger.info("Starting firehose consumer: topic=%s group=%s batch_size=%d", topic_name, group, batch_size)
+
+    try:
+        with Session(engine) as session:
+            while not shutdown_event.is_set():
+                inserted = _consume_batch(consumer, session, batch_size)
+                total_inserted += inserted
+                if inserted > 0:
+                    logger.info("Batch inserted %d rows (total: %d)", inserted, total_inserted)
+    except KafkaException:
+        logger.exception("Fatal Kafka error")
+    finally:
+        logger.info("Closing consumer (total inserted: %d)", total_inserted)
+        consumer.close()
+
+
+def _consume_batch(consumer: Consumer, session: Session, batch_size: int) -> int:
+    """Poll a batch of messages, transform, and insert into the database.
+
+    Args:
+        consumer: The Kafka consumer instance.
+        session: SQLAlchemy database session.
+        batch_size: Maximum number of messages to consume per batch.
+
+    Returns:
+        Number of rows successfully inserted.
+    """
+    messages = consumer.consume(num_messages=batch_size, timeout=POLL_TIMEOUT_SECONDS)
+    if not messages:
+        return 0
+
+    rows: list[dict] = []
+    for message in messages:
+        error = message.error()
+        if error is not None:
+            if error.code() == KafkaError._PARTITION_EOF:  # noqa: SLF001 — confluent-kafka exposes this as a pseudo-private constant; no public alternative exists
+                continue
+            logger.error("Consumer error: %s", error)
+            continue
+
+        row = _safe_transform(message.value(), session)
+        if row is not None:
+            rows.append(row)
+
+    if not rows:
+        consumer.commit(asynchronous=False)
+        return 0
+
+    inserted = ingest_batch(session, rows)
+    consumer.commit(asynchronous=False)
+    return inserted
+
+
+def _safe_transform(raw_value: bytes | None, session: Session) -> dict | None:
+    """Transform a Kafka message value into a Posts row, logging failures.
+
+    Args:
+        raw_value: Raw message bytes from Kafka.
+        session: SQLAlchemy session for logging failures.
+
+    Returns:
+        A transformed row dict, or None if transformation failed.
+    """
+    if raw_value is None:
+        return None
+
+    try:
+        message = json.loads(raw_value)
+    except (json.JSONDecodeError, UnicodeDecodeError):
+        logger.exception("Failed to decode Kafka message")
+        _log_failed_ingestion(session, raw_value, "JSON decode error")
+        return None
+
+    if not is_post_create(message):
+        return None
+
+    try:
+        return transform_jetstream_post(message)
+    except (KeyError, ValueError, TypeError):
+        logger.exception("Failed to transform Jetstream message")
+        _log_failed_ingestion(session, raw_value, "Transform error")
+        return None
+
+
+def _log_failed_ingestion(session: Session, raw_value: bytes, error: str) -> None:
+    """Log a failed ingestion to the FailedIngestion table.
+
+    Args:
+        session: SQLAlchemy session.
+        raw_value: The raw message bytes.
+        error: Description of the error.
+    """
+    try:
+        session.add(
+            FailedIngestion(
+                raw_line=raw_value.decode(errors="replace")[:10000],
+                error=error,
+            )
+        )
+        session.commit()
+    except Exception:
+        session.rollback()
+        logger.exception("Failed to log ingestion failure")
+
+
+def _create_consumer(servers: str, group: str) -> Consumer:
+    """Create a configured Kafka consumer.
+
+    Args:
+        servers: Kafka bootstrap servers string.
+        group: Consumer group ID.
+
+    Returns:
+        A configured confluent_kafka.Consumer.
+    """
+    config = {
+        "bootstrap.servers": servers,
+        "group.id": group,
+        "auto.offset.reset": "earliest",
+        "enable.auto.commit": False,
+        "max.poll.interval.ms": 300000,
+        "fetch.min.bytes": 1024,
+        "session.timeout.ms": 30000,
+    }
+    return Consumer(config)
+
+
+def _handle_shutdown(_signum: int, _frame: object) -> None:
+    """Signal handler to trigger graceful shutdown."""
+    logger.info("Shutdown signal received")
+    shutdown_event.set()
+
+
+if __name__ == "__main__":
+    app()

python/data_science/firehose_producer.py

@@ -0,0 +1,230 @@
+"""Bluesky Jetstream firehose to Kafka producer.
+
+Connects to the Bluesky Jetstream WebSocket API with zstd compression,
+filters for post creation events, and produces them to a Kafka topic.
+
+Usage:
+    firehose-producer
+    firehose-producer --kafka-servers kafka:9092 --topic bluesky.firehose.posts
+"""
+
+from __future__ import annotations
+
+import json
+import logging
+import signal
+from os import getenv
+from threading import Event
+from typing import Annotated
+
+import typer
+from compression import zstd
+from confluent_kafka import KafkaError, KafkaException, Producer
+from websockets.exceptions import ConnectionClosed
+from websockets.sync.client import connect
+
+logger = logging.getLogger(__name__)
+
+JETSTREAM_URL = "wss://jetstream2.us-east.bsky.network/subscribe"
+DEFAULT_TOPIC = "bluesky.firehose.posts"
+DEFAULT_KAFKA_SERVERS = "localhost:9092"
+POLL_INTERVAL = 100
+POST_COLLECTION = "app.bsky.feed.post"
+
+shutdown_event = Event()
+
+app = typer.Typer(help="Stream Bluesky firehose posts into Kafka.")
+
+
+@app.command()
+def main(
+    kafka_servers: Annotated[str, typer.Option(help="Kafka bootstrap servers")] = "",
+    topic: Annotated[str, typer.Option(help="Kafka topic to produce to")] = "",
+    collections: Annotated[str, typer.Option(help="Comma-separated collections to subscribe to")] = POST_COLLECTION,
+) -> None:
+    """Connect to Bluesky Jetstream and produce post events to Kafka."""
+    logging.basicConfig(
+        level=logging.INFO,
+        format="%(asctime)s %(levelname)s %(message)s",
+        datefmt="%H:%M:%S",
+    )
+
+    servers = kafka_servers or getenv("KAFKA_BOOTSTRAP_SERVERS", DEFAULT_KAFKA_SERVERS)
+    topic_name = topic or getenv("BLUESKY_FIREHOSE_TOPIC", DEFAULT_TOPIC)
+
+    signal.signal(signal.SIGTERM, _handle_shutdown)
+    signal.signal(signal.SIGINT, _handle_shutdown)
+
+    producer = _create_producer(servers)
+    cursor: int | None = None
+
+    logger.info("Starting firehose producer → %s on %s", topic_name, servers)
+
+    while not shutdown_event.is_set():
+        try:
+            cursor = _stream_loop(producer, topic_name, collections, cursor)
+        except (ConnectionClosed, OSError):
+            logger.exception("WebSocket disconnected, reconnecting")
+        except KafkaException:
+            logger.exception("Kafka error, reconnecting")
+
+        if not shutdown_event.is_set():
+            logger.info("Reconnecting in 5 seconds (cursor=%s)", cursor)
+            shutdown_event.wait(timeout=5)
+
+    logger.info("Shutting down, flushing producer")
+    producer.flush(timeout=30)
+    logger.info("Producer shutdown complete")
+
+
+def _stream_loop(
+    producer: Producer,
+    topic: str,
+    collections: str,
+    cursor: int | None,
+) -> int | None:
+    """Connect to Jetstream and stream messages to Kafka until disconnected.
+
+    Args:
+        producer: The Kafka producer instance.
+        topic: Kafka topic name.
+        collections: Comma-separated AT Protocol collections to subscribe to.
+        cursor: Optional microsecond timestamp to resume from.
+
+    Returns:
+        The last processed time_us cursor value.
+    """
+    url = _build_jetstream_url(collections, cursor)
+    logger.info("Connecting to %s", url)
+
+    message_count = 0
+    last_cursor = cursor
+
+    with connect(url, additional_headers={"Accept-Encoding": "zstd"}) as websocket:
+        logger.info("Connected to Jetstream")
+
+        while not shutdown_event.is_set():
+            try:
+                raw_frame = websocket.recv(timeout=10)
+            except TimeoutError:
+                producer.poll(0)
+                continue
+
+            text = _decode_frame(raw_frame)
+            message = json.loads(text)
+
+            time_us = message.get("time_us")
+            if time_us is not None:
+                last_cursor = time_us
+
+            if not _is_post_create(message):
+                continue
+
+            did = message.get("did", "")
+
+            try:
+                producer.produce(
+                    topic,
+                    key=did.encode(),
+                    value=text.encode() if isinstance(text, str) else text,
+                    callback=_delivery_callback,
+                )
+            except BufferError:
+                logger.warning("Producer buffer full, flushing")
+                producer.flush(timeout=10)
+                producer.produce(
+                    topic,
+                    key=did.encode(),
+                    value=text.encode() if isinstance(text, str) else text,
+                    callback=_delivery_callback,
+                )
+
+            message_count += 1
+            if message_count % POLL_INTERVAL == 0:
+                producer.poll(0)
+
+            if message_count % 10000 == 0:
+                logger.info("Produced %d messages (cursor=%s)", message_count, last_cursor)
+
+    return last_cursor
+
+
+def _build_jetstream_url(collections: str, cursor: int | None) -> str:
+    """Build the Jetstream WebSocket URL with query parameters.
+
+    Args:
+        collections: Comma-separated collection names.
+        cursor: Optional microsecond timestamp for resumption.
+
+    Returns:
+        The full WebSocket URL.
+    """
+    params = ["compress=true"]
+    for raw_collection in collections.split(","):
+        cleaned = raw_collection.strip()
+        if cleaned:
+            params.append(f"wantedCollections={cleaned}")
+    if cursor is not None:
+        params.append(f"cursor={cursor}")
+    return f"{JETSTREAM_URL}?{'&'.join(params)}"
+
+
+def _decode_frame(frame: str | bytes) -> str:
+    """Decode a WebSocket frame, decompressing zstd if binary.
+
+    Jetstream with compress=true sends zstd-compressed binary frames.
+
+    Args:
+        frame: Raw WebSocket frame data.
+
+    Returns:
+        The decoded JSON string.
+    """
+    if isinstance(frame, bytes):
+        return zstd.decompress(frame).decode()
+    return frame
+
+
+def _is_post_create(message: dict) -> bool:
+    """Check if a Jetstream message is a post creation commit."""
+    if message.get("kind") != "commit":
+        return False
+    commit = message.get("commit", {})
+    return commit.get("operation") == "create" and commit.get("collection") == POST_COLLECTION
+
+
+def _create_producer(servers: str) -> Producer:
+    """Create a configured Kafka producer.
+
+    Args:
+        servers: Kafka bootstrap servers string.
+
+    Returns:
+        A configured confluent_kafka.Producer.
+    """
+    config = {
+        "bootstrap.servers": servers,
+        "linger.ms": 50,
+        "batch.size": 65536,
+        "compression.type": "zstd",
+        "acks": "all",
+        "retries": 5,
+        "retry.backoff.ms": 500,
+    }
+    return Producer(config)
+
+
+def _delivery_callback(error: KafkaError | None, _message: object) -> None:
+    """Log delivery failures from the Kafka producer."""
+    if error is not None:
+        logger.error("Kafka delivery failed: %s", error)
+
+
+def _handle_shutdown(_signum: int, _frame: object) -> None:
+    """Signal handler to trigger graceful shutdown."""
+    logger.info("Shutdown signal received")
+    shutdown_event.set()
+
+
+if __name__ == "__main__":
+    app()

systems/jeeves/services/bluesky_firehose.nix

@@ -0,0 +1,96 @@
+{
+  pkgs,
+  inputs,
+  ...
+}:
+let
+  commonEnv = {
+    PYTHONPATH = "${inputs.self}";
+    KAFKA_BOOTSTRAP_SERVERS = "localhost:9092";
+    BLUESKY_FIREHOSE_TOPIC = "bluesky.firehose.posts";
+  };
+  commonServiceConfig = {
+    Type = "simple";
+    WorkingDirectory = "${inputs.self}";
+    User = "richie";
+    Group = "users";
+    Restart = "on-failure";
+    RestartSec = "10s";
+    StandardOutput = "journal";
+    StandardError = "journal";
+    NoNewPrivileges = true;
+    ProtectSystem = "strict";
+    ProtectHome = "read-only";
+    PrivateTmp = true;
+    ReadOnlyPaths = [ "${inputs.self}" ];
+  };
+in
+{
+  systemd.services.bluesky-firehose-topic-init = {
+    description = "Create Kafka topic for Bluesky firehose";
+    after = [ "apache-kafka.service" ];
+    requires = [ "apache-kafka.service" ];
+    wantedBy = [ "multi-user.target" ];
+
+    serviceConfig = {
+      Type = "oneshot";
+      RemainAfterExit = true;
+      ExecStart = pkgs.writeShellScript "create-bluesky-topic" ''
+        ${pkgs.apacheKafka}/bin/kafka-topics.sh \
+          --bootstrap-server localhost:9092 \
+          --create \
+          --if-not-exists \
+          --topic bluesky.firehose.posts \
+          --partitions 6 \
+          --replication-factor 1
+      '';
+    };
+  };
+
+  systemd.services.bluesky-firehose-producer = {
+    description = "Bluesky Jetstream to Kafka producer";
+    after = [
+      "network.target"
+      "apache-kafka.service"
+      "bluesky-firehose-topic-init.service"
+    ];
+    requires = [
+      "apache-kafka.service"
+      "bluesky-firehose-topic-init.service"
+    ];
+    wantedBy = [ "multi-user.target" ];
+
+    environment = commonEnv;
+
+    serviceConfig = commonServiceConfig // {
+      ExecStart = "${pkgs.my_python}/bin/python -m python.data_science.firehose_producer";
+    };
+  };
+
+  systemd.services.bluesky-firehose-consumer = {
+    description = "Bluesky Kafka to PostgreSQL consumer";
+    after = [
+      "network.target"
+      "apache-kafka.service"
+      "bluesky-firehose-topic-init.service"
+      "postgresql.service"
+    ];
+    requires = [
+      "apache-kafka.service"
+      "bluesky-firehose-topic-init.service"
+      "postgresql.service"
+    ];
+    wantedBy = [ "multi-user.target" ];
+
+    environment = commonEnv // {
+      DATA_SCIENCE_DEV_DB = "data_science_dev";
+      DATA_SCIENCE_DEV_USER = "richie";
+      DATA_SCIENCE_DEV_HOST = "/run/postgresql";
+      DATA_SCIENCE_DEV_PORT = "5432";
+    };
+
+    serviceConfig = commonServiceConfig // {
+      ExecStart = "${pkgs.my_python}/bin/python -m python.data_science.firehose_consumer";
+    };
+  };
+}