Migrate Postgres Tables To Hypertables

Timescale (TigerData)OfficialCreated by tigerdataDistributed by Timescale (TigerData)

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Data and AI
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From the author

Use this skill to migrate identified PostgreSQL tables to Timescale/TimescaleDB hypertables with optimal configuration and validation. **Trigger when user asks to:** - Migrate or convert PostgreSQL tables to hypertables - Execute hypertable migration with minimal downtime - Plan blue-green migration for large tables - Validate hypertable migration success - Configure compression after migration **Prerequisites:** Tables already identified as candidates (use find-hypertable-candidates first if needed) **Keywords:** migrate to hypertable, convert table, Timescale, TimescaleDB, blue-green migration, in-place conversion, create_hypertable, migration validation, compression setup Step-by-step migration planning including: partition column selection, chunk interval calculation, PK/constraint handling, migration execution (in-place vs blue-green), and performance validation queries.

— the description by tigerdata

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

This skill provides a structured, step-by-step procedure for converting standard PostgreSQL tables into TimescaleDB hypertables. It covers critical planning phases, including partition column selection, chunk interval calculation, and constraint compatibility. The skill details two primary migration paths: an in-place conversion for smaller datasets and a blue-green migration strategy for large tables to minimize downtime. It also includes extensive post-migration validation steps to ensure query performance, compression efficiency, and proper chunk exclusion.

What it does

Analyzes tables to select optimal partition columns and chunk intervals.
Validates and modifies primary key and unique constraints for hypertable compatibility.
Configures columnstore compression policies for storage optimization.
Executes in-place or blue-green migration strategies based on table size.
Provides SQL queries for performance validation and chunk exclusion verification.
Sets up monitoring views to track compression coverage and storage metrics.

When to use it

When you need to convert existing PostgreSQL tables to TimescaleDB for time-series data management.
When migrating large tables that require minimal downtime via blue-green deployment.
When you need to optimize storage and query performance for time-series workloads.
When you need to verify that your new hypertable is correctly configured for chunk exclusion and compression.

Advantages

Reduces storage footprint through automated columnstore compression.
Improves query performance for time-series data via chunk exclusion.
Provides safe, step-by-step migration paths for different data volumes.
Includes built-in validation to ensure performance does not degrade post-migration.

Usage examples

“How do I migrate my 'sensor_data' table to a hypertable?”: The agent will guide you through selecting the partition column, calculating the chunk interval, checking constraint compatibility, and choosing between in-place or blue-green migration.
“I have a 50GB table, how can I migrate it to TimescaleDB with minimal downtime?”: The agent will recommend the blue-green migration strategy, providing the necessary SQL steps to create a new table, batch-migrate data, and swap the tables during a maintenance window.
“How do I verify that my new hypertable is compressing data correctly?”: The agent will provide SQL queries to check the compression percentage, chunk status, and verify that the compression policy is effectively reducing storage size.

Install

Download the skill as a ZIP:
https://autogineer.com/agent-skills/timescale/migrate-postgres-tables-to-hypertables/download

Unzip it into the cross-client skills folder of your project:

mkdir -p .agents/skills && unzip migrate-postgres-tables-to-hypertables.zip -d .agents/skills

Documentation by tigerdata

PostgreSQL to TimescaleDB Hypertable Migration

Migrate identified PostgreSQL tables to TimescaleDB hypertables with optimal configuration, migration planning and validation.

Prerequisites: Tables already identified as hypertable candidates (use companion "find-hypertable-candidates" skill if needed).

Step 1: Optimal Configuration

Partition Column Selection

-- Find potential partition columns
SELECT column_name, data_type, is_nullable
FROM information_schema.columns
WHERE table_name = 'your_table_name'
  AND data_type IN ('timestamp', 'timestamptz', 'bigint', 'integer', 'date')
ORDER BY ordinal_position;

Requirements: Time-based (TIMESTAMP/TIMESTAMPTZ/DATE) or sequential integer (INT/BIGINT)

Should represent when the event actually occurred or sequential ordering.

Common choices:

timestamp, created_at, event_time - when event occurred
id, sequence_number - auto-increment (for sequential data without timestamps)
ingested_at - less ideal, only if primary query dimension
updated_at - AVOID (records updated out of order, breaks chunk distribution) unless primary query dimension

Special Case: table with BOTH ID AND Timestamp

When table has sequential ID (PK) AND timestamp that correlate:

-- Partition by ID, enable minmax sparse indexes on timestamp
SELECT create_hypertable('orders', 'id', chunk_time_interval => 1000000);
ALTER TABLE orders SET (
    timescaledb.sparse_index = 'minmax(created_at),...'
);

Sparse indexes on time column enable skipping compressed blocks outside queried time ranges.

Use when: ID correlates with time (newer records have higher IDs), need ID-based lookups, time queries also common

Chunk Interval Selection

-- Ensure statistics are current
ANALYZE your_table_name;

-- Estimate index size per time unit
WITH time_range AS (
    SELECT
        MIN(timestamp_column) as min_time,
        MAX(timestamp_column) as max_time,
        EXTRACT(EPOCH FROM (MAX(timestamp_column) - MIN(timestamp_column)))/3600 as total_hours
    FROM your_table_name
),
total_index_size AS (
    SELECT SUM(pg_relation_size(indexname::regclass)) as total_index_bytes
    FROM pg_stat_user_indexes
    WHERE schemaname||'.'||tablename = 'your_schema.your_table_name'
)
SELECT
    pg_size_pretty(tis.total_index_bytes / tr.total_hours) as index_size_per_hour
FROM time_range tr, total_index_size tis;

Target: Indexes of recent chunks < 25% of RAM Default: IMPORTANT: Keep default of 7 days if unsure Range: 1 hour minimum, 30 days maximum

Example: 32GB RAM → target 8GB for recent indexes. If index_size_per_hour = 200MB:

1 hour chunks: 200MB chunk index size × 40 recent = 8GB ✓
6 hour chunks: 1.2GB chunk index size × 7 recent = 8.4GB ✓
1 day chunks: 4.8GB chunk index size × 2 recent = 9.6GB ⚠️ Choose largest interval keeping 2+ recent chunk indexes under target.

Primary Key/ Unique Constraints Compatibility

-- Check existing primary key/ unique constraints
SELECT conname, pg_get_constraintdef(oid) as definition
FROM pg_constraint
WHERE conrelid = 'your_table_name'::regclass AND contype = 'p' OR contype = 'u';

Rules: PK/UNIQUE must include partition column

Actions:

No PK/UNIQUE: No changes needed
PK/UNIQUE includes partition column: No changes needed
PK/UNIQUE excludes partition column: ⚠️ ASK USER PERMISSION to modify PK/UNIQUE

Example: user prompt if needed:

"Primary key (id) doesn't include partition column (timestamp). Must modify to PRIMARY KEY (id, timestamp) to convert to hypertable. This may break application code. Is this acceptable?" "Unique constraint (id) doesn't include partition column (timestamp). Must modify to UNIQUE (id, timestamp) to convert to hypertable. This may break application code. Is this acceptable?"

If the user accepts, modify the constraint:

BEGIN;
ALTER TABLE your_table_name DROP CONSTRAINT existing_pk_name;
ALTER TABLE your_table_name ADD PRIMARY KEY (existing_columns, partition_column);
COMMIT;

If the user does not accept, you should NOT migrate the table.

IMPORTANT: DO NOT modify the primary key/unique constraint without user permission.

Compression Configuration

For detailed segment_by and order_by selection, see "setup-timescaledb-hypertables" skill. Quick reference:

segment_by: Most common WHERE filter with >100 rows per value per chunk

IoT: device_id
Finance: symbol
Analytics: user_id or session_id

-- Analyze cardinality for segment_by selection
SELECT column_name, COUNT(DISTINCT column_name) as unique_values,
       ROUND(COUNT(*)::float / COUNT(DISTINCT column_name), 2) as avg_rows_per_value
FROM your_table_name GROUP BY column_name;

order_by: Usually timestamp DESC. The (segment_by, order_by) combination should form a natural time-series progression.

If column has <100 rows/chunk (too low for segment_by), prepend to order_by: order_by='low_density_col, timestamp DESC'

sparse indexes: add minmax on the columns that are used in the WHERE clauses but are not in the segment_by or order_by. Use minmax for columns used in range queries.

ALTER TABLE your_table_name SET (
    timescaledb.enable_columnstore,
    timescaledb.segmentby = 'entity_id',
    timescaledb.orderby = 'timestamp DESC'
    timescaledb.sparse_index = 'minmax(value_1),...'
);

-- Compress after data unlikely to change (adjust `after` parameter based on update patterns)
CALL add_columnstore_policy('your_table_name', after => INTERVAL '7 days');

Step 2: Migration Planning

Pre-Migration Checklist

[ ] Partition column selected
[ ] Chunk interval calculated (or using default)
[ ] PK includes partition column OR user approved modification
[ ] No Hypertable→Hypertable foreign keys
[ ] Unique constraints include partition column
[ ] Created compression configuration (segment_by, order_by, sparse indexes, compression policy)
[ ] Maintenance window scheduled / backup created.

Migration Options

Option 1: In-Place (Tables < 1GB)

-- Enable extension
CREATE EXTENSION IF NOT EXISTS timescaledb;

-- Convert to hypertable (locks table)
SELECT create_hypertable(
    'your_table_name',
    'timestamp_column',
    chunk_time_interval => INTERVAL '7 days',
    if_not_exists => TRUE
);

-- Configure compression
ALTER TABLE your_table_name SET (
    timescaledb.enable_columnstore,
    timescaledb.segmentby = 'entity_id',
    timescaledb.orderby = 'timestamp DESC',
    timescaledb.sparse_index = 'minmax(value_1),...'
);

-- Adjust `after` parameter based on update patterns
CALL add_columnstore_policy('your_table_name', after => INTERVAL '7 days');

Option 2: Blue-Green (Tables > 1GB)

-- 1. Create new hypertable
CREATE TABLE your_table_name_new (LIKE your_table_name INCLUDING ALL);

-- 2. Convert to hypertable
SELECT create_hypertable('your_table_name_new', 'timestamp_column');

-- 3. Configure compression
ALTER TABLE your_table_name_new SET (
    timescaledb.enable_columnstore,
    timescaledb.segmentby = 'entity_id',
    timescaledb.orderby = 'timestamp DESC'
);

-- 4. Migrate data in batches
INSERT INTO your_table_name_new
SELECT * FROM your_table_name
WHERE timestamp_column >= '2024-01-01' AND timestamp_column < '2024-02-01';
-- Repeat for each time range

-- 4. Enter maintenance window and do the following:

-- 5. Pause modification of the old table.

-- 6. Copy over the most recent data from the old table to the new table.

-- 7. Swap tables
BEGIN;
ALTER TABLE your_table_name RENAME TO your_table_name_old;
ALTER TABLE your_table_name_new RENAME TO your_table_name;
COMMIT;

-- 8. Exit maintenance window.

-- 9. (sometime much later) Drop old table after validation
-- DROP TABLE your_table_name_old;

Common Issues

Foreign Keys

-- Check foreign keys
SELECT conname, confrelid::regclass as referenced_table
FROM pg_constraint
WHERE (conrelid = 'your_table_name'::regclass
    OR confrelid = 'your_table_name'::regclass)
  AND contype = 'f';

Supported: Plain→Hypertable, Hypertable→Plain NOT supported: Hypertable→Hypertable

⚠️ CRITICAL: Hypertable→Hypertable FKs must be dropped (enforce in application). ASK USER PERMISSION. If no, STOP MIGRATION.

Large Table Migration Time

-- Rough estimate: ~75k rows/second
SELECT
    pg_size_pretty(pg_total_relation_size(tablename)) as size,
    n_live_tup as rows,
    ROUND(n_live_tup / 75000.0 / 60, 1) as estimated_minutes
FROM pg_stat_user_tables
WHERE tablename = 'your_table_name';

Solutions for large tables (>1GB/10M rows): Use blue-green migration, migrate during off-peak, test on subset first

Step 3: Performance Validation

Chunk & Compression Analysis

-- View chunks and compression
SELECT
    chunk_name,
    pg_size_pretty(total_bytes) as size,
    pg_size_pretty(compressed_total_bytes) as compressed_size,
    ROUND((total_bytes - compressed_total_bytes::numeric) / total_bytes * 100, 1) as compression_pct,
    range_start,
    range_end
FROM timescaledb_information.chunks
WHERE hypertable_name = 'your_table_name'
ORDER BY range_start DESC;

Look for:

Consistent chunk sizes (within 2x)
Compression >90% for time-series
Recent chunks uncompressed
Chunk indexes < 25% RAM

Query Performance Tests

-- 1. Time-range query (should show chunk exclusion)
EXPLAIN (ANALYZE, BUFFERS)
SELECT COUNT(*), AVG(value)
FROM your_table_name
WHERE timestamp >= NOW() - INTERVAL '1 day';

-- 2. Entity + time query (benefits from segment_by)
EXPLAIN (ANALYZE, BUFFERS)
SELECT * FROM your_table_name
WHERE entity_id = 'X' AND timestamp >= NOW() - INTERVAL '1 week';

-- 3. Aggregation (benefits from columnstore)
EXPLAIN (ANALYZE, BUFFERS)
SELECT DATE_TRUNC('hour', timestamp), entity_id, COUNT(*), AVG(value)
FROM your_table_name
WHERE timestamp >= NOW() - INTERVAL '1 month'
GROUP BY 1, 2;

✅ Good signs:

"Chunks excluded during startup: X" in EXPLAIN plan
"Custom Scan (ColumnarScan)" for compressed data
Lower "Buffers: shared read" in EXPLAIN ANALYZE plan than pre-migration
Faster execution times

❌ Bad signs:

"Seq Scan" on large chunks
No chunk exclusion messages
Slower than before migration

Storage Metrics

-- Monitor compression effectiveness
SELECT
    hypertable_name,
    pg_size_pretty(total_bytes) as total_size,
    pg_size_pretty(compressed_total_bytes) as compressed_size,
    ROUND(compressed_total_bytes::numeric / total_bytes * 100, 1) as compressed_pct_of_total,
    ROUND((uncompressed_total_bytes - compressed_total_bytes::numeric) /
          uncompressed_total_bytes * 100, 1) as compression_ratio_pct
FROM timescaledb_information.hypertables
WHERE hypertable_name = 'your_table_name';

Monitor:

compression_ratio_pct >90% (typical time-series)
compressed_pct_of_total growing as data ages
Size growth slowing significantly vs pre-hypertable
Decreasing compression_ratio_pct = poor segment_by

Troubleshooting

Poor Chunk Exclusion

-- Verify chunks are being excluded
EXPLAIN (ANALYZE, BUFFERS)
SELECT * FROM your_table_name
WHERE timestamp >= '2024-01-01' AND timestamp < '2024-01-02';
-- Look for "Chunks excluded during startup: X"

Poor Compression

-- Get newest compressed chunk name
SELECT chunk_name FROM timescaledb_information.chunks
WHERE hypertable_name = 'your_table_name'
  AND compressed_total_bytes IS NOT NULL
ORDER BY range_start DESC LIMIT 1;

-- Analyze segment distribution
SELECT segment_by_column, COUNT(*) as rows_per_segment
FROM _timescaledb_internal._hyper_X_Y_chunk  -- Use actual chunk name
GROUP BY 1 ORDER BY 2 DESC;

Look for: <20 rows per segment: Poor segment_by choice (should be >100) => Low compression potential.

Poor insert performance

Check that you don't have too many indexes. Unused indexes hurt insert performance and should be dropped.

SELECT
    schemaname,
    tablename,
    indexname,
    idx_tup_read,
    idx_tup_fetch,
    idx_scan
FROM pg_stat_user_indexes
WHERE tablename LIKE '%your_table_name%'
ORDER BY idx_scan DESC;

Look for: Unused indexes via a low idx_scan value. Drop such indexes (but ask user permission).

Ongoing Monitoring

-- Monitor chunk compression status
CREATE OR REPLACE VIEW hypertable_compression_status AS
SELECT
    h.hypertable_name,
    COUNT(c.chunk_name) as total_chunks,
    COUNT(c.chunk_name) FILTER (WHERE c.compressed_total_bytes IS NOT NULL) as compressed_chunks,
    ROUND(
        COUNT(c.chunk_name) FILTER (WHERE c.compressed_total_bytes IS NOT NULL)::numeric /
        COUNT(c.chunk_name) * 100, 1
    ) as compression_coverage_pct,
    pg_size_pretty(SUM(c.total_bytes)) as total_size,
    pg_size_pretty(SUM(c.compressed_total_bytes)) as compressed_size
FROM timescaledb_information.hypertables h
LEFT JOIN timescaledb_information.chunks c ON h.hypertable_name = c.hypertable_name
GROUP BY h.hypertable_name;

-- Query this view regularly to monitor compression progress
SELECT * FROM hypertable_compression_status
WHERE hypertable_name = 'your_table_name';

Look for:

compression_coverage_pct should increase over time as data ages and gets compressed.
total_chunks should not grow too quickly (more than 10000 becomes a problem).
You should not see unexpected spikes in total_size or compressed_size.

Success Criteria

✅ Migration successful when:

All queries return correct results
Query performance equal or better
Compression >90% for older data
Chunk exclusion working for time queries
Insert performance acceptable

❌ Investigate if:

Query performance >20% worse
Compression <80%
No chunk exclusion
Insert performance degraded
Increased error rates

Focus on high-volume, insert-heavy workloads with time-based access patterns for best ROI.

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Requirements and compatibility

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

The author says: Requires PostgreSQL 15+ with TimescaleDB

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Created by

tigerdata

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Distributed by

Timescale (TigerData)

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